Enlarging Lens

an object of height 4 cm is placed at a distance of 20 cm from a convex lens of focal length 10 cm.?

find the nature of the image.

a. virtual, enlarged
b. virtual, inverted
c. real, enlarged
d. real, inverted

going by the chart in my book, says that the only way a convex mirror displays the image is virtual and reduced, which is not one of the choices. is this just a stupid mistake by the writer, or am i missing something totally.

d. Real and Inverted

Nikon El Nikkor f4 50mm Enlarger Lens $50.00

25mm Jam Nut Brass – Enlarger Lens Retaining Ring – USED D7LL $8.79

Russian Portable Spy Film Enlarger Model YNA-5M cccp, with Lens & Carry Case A+ $50.00

29mm 30mm Jam Nut w/3 Mounting Holes – Enlarger Lens Retaining Ring – USED V189 $7.99

39mm Jam Nut – Metal – Enlarger Lens Retaining Ring – USED V192 $6.99

Kodak Anastigmat F:4.5 105mm Enlarger Lens with Board $60.00

Sonnar Zeiss Jena 5cm f2 Rangefinder lens 1:2 $135.00

Componon f/4 28mm M39 ENLARGER Lens rare $300.00

MIKAR/S 4.5/55mm Poland M42 Lens for Enlarger $20.00

Carl Zeiss S-Planar 120mm f/5,6 $338.00

VEGA-11U 2.8 50mm ENLARGER Russian Soviet USSR Lens $10.00

MINOLTA M39 E.ROKKOR 4.5 f=105mm ELARGING LENS 4.5/105mm MINT LENS BUBBLE INCLUD $149.00

RARE RUSSIAN ENLARGER LENS INDUSTAR-50U-1 #896 $9.99

Condenser Lens Assembly for Beseler 23C Enlargers, Set of 3 $25.00

Omega Condenser for 4×5 D Series Enlarger, Set of 2 $25.00

SCHNEIDER KREUZNACHT COMPONON 80/5.6 ENLARGING LENS $85.00

LENS SCHNEIDER KREUZNACHT COMPONON 80/5.6 PERFECT GLASS $87.00

RODENSTOCK 75mm/4.5 PERFECT GLASS GREAT FOR HASSELBLAD $55.00

MINOLTA CE 50mm f2.8 Enlarger PRO Lens EXCELLENT *Mint* $81.01

MINOLTA ROKKOR 80mm f5.6 Enlarger PRO Lens EXCELLENT Mint-Rare $124.01

Rodenstock 150mm Rodagon enlarging lens $99.00

SCHNEIDER-KREUZNACH COMPONON-S 5,6/135mm Medium Format Enlarger Lens – 40mm Fit? $1.56

SCHNEIDER-KREUZNACH COMPONON-S 5,6/100mm Medium Format Enlarger Lens – 38mm Fit? $16.60

SCHNEIDER-KREUZNACH COMPONON-S 5,6/100mm Medium Format Enlarger Lens – 30mm Fit? $1.56

Nikon EL Nikkor 1:4 f = 50mm $55.00

Bestwell Micro Sight 25X Enlarger Grain Focusing Scope NIB $29.99

Vivitar VHE 100mm f5.6 and beseler colorpro 50mm f/2.8 $29.99

1970s vintage nikon el-nikkor 50mm f/4 enlarger lens l39 thread $15.73

RODENSTOCK OMEGARON 75mm 1:4.5 ENLARGER LENS BRAND NEW IN BOX $39.99

RODENSTOCK OMEGAR 1:4,5 F=50MM ENLARGING LENS $19.95

SCHNEIDER KREUZNACH COMPONON 135/5.6 LATE BLACK PERFECT GLASS SMOOTH APERATURE $85.00

SCHNEIDER-KREUZNACH ENLARGER LENS: W.A.COMPONON 5.6/60MM $20.50

NIKON 50/2.8 EL-NIKKOR ENLARGING LENS PERFECT GLASS IN GLOBE PERFECT $85.00

ENLARGER LENS – EL-NIKKOR F4 – 50MM $19.00

ENLARGER LENS – TELESAR F3.5 – 50MM $12.00

***Repromaster Barrel Lens*** $11.00

OMEGA D2V Darkroom Enlarger, 3 lenses, 5 carriers, 2 lensboards, base, etc. $450.00

Metal 25mm Lock Ring for Enlarger Lenses & #00 Shutters $23.58

Nikon El-Nikkor 50mm 1:2.8 Enlarger Lens $45.00

Metal 25mm Lock Ring for Enlarger Lenses & #00 Shutters $34.38

Nikon EL-NIKKOR 50MM f=1:4 ENLARGING LENS IN BUBBLE WITH RETAINING RING New CP-2 $0.99

SANKYO KOKI – KOMURA LENS MFG. LTD ENLARGER LENS KOMURANON-E f=105mm 1:5.6 $20.00

Nikon El-Nikkor 40mm Enlarging Lens 1:3.5 Excellent Condition with Buddle Case! $29.99

Secondary Condenser Lens for Omega B-22 Enlarger $20.00

LOT OF 3 OMICRON-EL ENLARGING LENSES – 1:4.5/75, 1:5.6/135, 1:2.8/50 $49.95

BESELER 23C EL-OMEGAR 1:3.5 F=50mm ENLARGING LENS & LENSBOARD $24.95

NIKON EL-NIKKOR 1:2.8 50mm ENLARGER LENS with MOUNTING RING $74.95

NEW IN BOX Beseler 75mm f/3.5 Beslar 8680 Enlarging Lens for 6×6 cm Film $29.95

BESELAR 8021 LENSBOARD W/PILOT LIGHT 50-60ENLARGING LENSES $50.00

RODENSTOCK Enlarging lens RODAGON 150mm f/5.6 w/cap & mount $99.00

Omega 1/2″ Cup Lens Plate for D5500 Enlarger $4.95

FEDERAL ANASTIGMAT FEDAR F:6.3 3.5″ EE ENLARGING LENS $19.64

RODENSTOCK 50MM F2.8 ROGONAR S ENLARGING LENS NEARMINT CONDITION $34.99

Beseler 50mm f/3.5 Beseler Enlarger Lens 8670 $14.00

Kalt Deluxe 75mm 1:3.5 Enlarging lens $29.00

NIKON EL NIKKOR 50MM F4 ENLARGER LENS EXCELLENT+++ $49.99

KOMURA KOMURANON-E 150MM F5.6 ENLARGER LENS GOOD $125.00

ROLLEI ROLLEINAR-EL 50MM F3.5 ENLARGER LENS $39.00

Beseler 75mm f/3.5 Beseler Enlarger Lens 8670 $14.00

DEJUR PROJECTION CHROMTAR f4.5 135mm lens Y2179 $32.00

PRINZ 1:6.3 210mm Enlarging lens, Serial 10216, can be used with Copal shutter $29.00

Zeiss Ikon 4 X 5 Auto Focus Enlarger With A Zeiss Proj-Tessar f4.5 13.5cm Lens $600.00

PERFEX Anastigmat 135mm 1:4.5 Enlarging lens, Serial 15093 $59.00

Enlarger shutter Rodenstock? mounted on board $14.99

RODENSTOCK OMEGAR 1:4,5 F=75 MM ENLARGING LENS $19.95

ACCURA 50mm f/3.8 DARKROOM ENLARGING LENS W/ 39mm MOUNTING THREADS $20.00

Kinex Electro Timer Model 2 + Melles Griot Computar dL 5.6/135 Enlarger Lens etc $50.00

Ernst Lietz 9.5 cm (enlarging?) lens $2.13

NIKON EL-NIKKOR 150mm ENLARGING LENS – f 5.6 – f 45 Exceptionally Clean! $99.99

NIPPON KOGAKU EL-Nikkor 50mm 1:2.8 Enlarging Lens, No. 907209 $55.00

P&B 75mm 1:3.5 Anastigmat Enlarging lens $44.00

TAMRON 60Wp FOTOVIX Lens for 35mm Film NO RESERVE $2.96

NR, WOLLENSAK 162mm F4.5 ENLARGING VELOSTIGMAT LENS $15.99

Betavaron 3.5 11/0.08 Schneider Kreuznach Kreorite Zoom Enlarger Lens $122.99

SCHNEIDER-KREUZNACH CURTAGON 35mm 1:2.8 f2.8 LENS w/CAPS CLEAN 16mm? ENLARGER? $78.00

Leitz 5 cm (50mm Enlarging?) lens $0.99

VINTAGE SCHNEIDER KREUZNACH COMPONON 1:4/50 MADE IN GERMANY $14.99

Vintage SPIRATONE ENLARGER & LIGHT & LENS $79.99

RODENSTOCK OMEGAR 50mm 4.5 ENLARGER LENS w Lensboard $14.99

Enlarging Raptar Wollensak 162mm f/4.5 Lens $79.99

Rodenstock Rodagon 150mm f 5.6 enlarger lens NR $199.00

VINTAGE WOLLENSAK 9.5″ ENLARGING RAPTAR LENS 241mm F/4.5 $10.50

Refurbished Beseler 67CP Condenser Enlarger w/ 50mm Lens & 35mm Negative Carrier $391.98

EL Nikkor 5.6 80mm enlarger lens in hard plastic case Nikon $99.95

Schneider Optik Kreuznach Componon 4 50mm enlarger lens $39.95

OMEGA D5 ENLARGER LAMPHOUSE, DV CONDENSER LENS $42.99

Schneider Betavaron 3.5…11/0.08 Zoom Enlarger Lens #Couple/Box,Caps $880.00

VORN 90mm 1:4.5 Enlarging Lens, Model No CA 642, Serial 5190 $65.00

VORN 75mm 1:3.5 Enlarging Lens, No. 5390 $49.00

Beseler 39mm Leica Mount Lens Jam Nut. #8095 $7.99

300mm f5.6 Schneider Componon-S lens w/retaining ring $519.95

Rodenstock 150mm Rodagon latest coating and both lens caps, lensboard available $249.95

Nikon EL-Nikkor 50mm 1:4 Enlarging Lens W Cap & CP-2 Protective Crystal Case !!! $0.99

KODAK EKTAR 50MM 4.5 ENLARGING LENS. BESELER BOARD. CAP. $69.99

VEGA-11U 2.8 50mm ENLARGER Russian Soviet USSR Lens $25.00

el nikkor 50mm 2.8 enlarging lens $25.00

Vintage Voss ENLARGING LENS w/Box – No. 4631 – 75mm $9.95

Durst Neonon 1:5.6 f=105mm Enlarging Lens $10.00

Schneider Componon 5.6/35 glasses. $49.90

Schneider Kreuznach W.A. Componon 4/40 w/Beseler Lensboard – Low Reserve! $10.00

Citizenship in an Enlarging Europe $105 This study considers the impact of economic, political and social transformation in Central and Eastern Europe in the context of EU enlargement. Using the lens of gender, this bookexamines the processes of democratization, marketization and nationalism. Thisnew edition includes a new preface and updatesstatistics throughout.

Designer Contact Lens Case $7.29 Designer contact lens case – great gift idea. Case holds sturdy screw-top lens case and mirror.

Pet Contact Lens Cases $7.29 Amcon Pet Contact Lens Case is an animal lover’s dream lens case. The Pet Contact Lens Case features an image of your favorite animal, and is a durable case suited for travel. It features a screw-top lens holder on the interior along with a mirror for lens application.

Leather Contact Lens Cases $8.95 Amcon Leather Contact Lens Case is a stylish alternative to traditionally bland contact lens cases. Ideal for travel, the Leather Contact Lens Case is durable enough to carry around without worrying about spilling, and even comes with an interior mirror for lens application.

For Safe Sport Practice Sound Vision Care

Everyone who takes part in sport should be aware of the potential danger to their eyes. Much care is usually taken over selecting the correct kit or equipment for their particular sport, but vision care, perhaps, doesn’t always get the priority it deserves.

Your eyes are among the most delicate and vulnerable organs of the body. Yet, the current fashion for rimless or narrow-rimmed glasses with smaller lenses might lead you to believe that this type of eyewear offers adequate protection for your eyes when playing sport. Or, perhaps, if wearing glasses is impractical, you might adopt a cavalier attitude to protective eyewear and leave your eyes unprotected.

You could easily regret exposing your eyes to potential risk, however. It is not necessary to have a severe laceration or penetrating eye injury to suffer internal damage to the eyes. Relatively minor injuries sustained when playing sport can create long-term visual problems which can lead eventually to vision loss.

Vision care, then, is not an optional extra but a vital prerequisite for everybody participating in sport and, as a first step, it is advisable to have an eye check-up. This presents you with the ideal opportunity to discuss your particular visual requirements, thereby ensuring your safety and comfort.

Making the right choice doesn’t necessarily mean that everyone who plays the same sport opts for the same eyewear. Let’s take golf, for example. Many golfers prefer wider-framed, tinted prescription sunglasses to give them protection from the glare of the sun. Others prefer contact lenses.

However, as one leading golfer recently found to his cost, contact lenses provide the wearer with very little eye protection. Trapped in a very deep bunker with sheer sides, he successfully dislodged the ball from the slope but, at the same time, managed to lodge several grains of sand in his eye. The incident broke his concentration and rhythm, and his subsequent performance was distanctly under-par!

Instead of rubbing the eye vigorously, as a contact lens wearer he should have immediately removed the lens and cleaned it thoroughly before replacing it. Obviously, in this instance, it would be neither feasible nor appropriate to wear contact lenses in conjunction with protective goggles.

The TV commentator at the golf tournament remarked that a solution increasingly adopted by many top-ranking golfers is corrective eye surgery. Again, though, this is not suitable for everybody who plays this sport. The most important consideration is to be aware of the potential risks and protect your eyes accordingly.

Increasingly, snooker players are choosing specially designed glasses with an enlarged upper area of the lens. It almost looks as if they are wearing their glasses upside down! This enlarged lens design particularly suits those players who are short-sighted. They need to look down the cue to the cue ball as well as raise their eyes to the pocket and surrounding balls on the table without lifting their head. An applied anti-reflective coating offers extra protection for their eyes from the glare of overhead fluorescent lighting.

When choosing frames safety is paramount closely followed by comfort. They need to be strong enough to resist a hard impact but lightweight enough to make for comfortable wearing. An elasticated sports band, along with a padded bridge on metal frames, provides both safety and comfort.

Lenses should be equally strong enough to resist a hard impact. Polycarbonate, a very tough material, is used to make protective goggles for squash players, but is suitable for many other sports. They are far preferable to easily-shattered glass lenses, and even to toughened lenses.

Enjoy playing your sport, but don’t play about with your eyes: they are very precious assets. Find a practitioner who will help you keep them safe.

About the Author

© 2006 Maureen P Cook
Maureen Cook writes articles for publication
from her home in England. In this article, she shows you how good vision care can help protect your eyes playing sports.
To read more, go to
Vision
Care

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