Ray OpticsPower of a Lens (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 6  8 of 8
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Question number: 6
» Ray Optics » Power of a Lens
Question
A slide projector lens has a focal length 10 cm. It throws an image of a 2cm × 2cm slide on a screen 5 m from the lens. Find the size of the picture on the screen
Choices
Choice (4)  Response  

a.  (78 × 78) cm ^{2} 

b.  (64 × 64) cm ^{2} 

c.  (88 × 88) cm ^{2} 

d.  (98 × 98) cm ^{2} 

Question number: 7
» Ray Optics » Power of a Lens
Question
If the focal length of a magnifier is 5 cm calculate the power of the lens.
Choices
Choice (4)  Response  

a.  15 D 

b.  20 D 

c.  10 D 

d.  5 D 

Question number: 8
» Ray Optics » Power of a Lens
Question
If the focal length of a magnifier is 5 cm find the magnifying power of the lens for relaxed and strained eye.
Choices
Choice (4)  Response  

a.  2×, 3× 

b.  4×, 5× 

c.  l×, 2× 

d.  4×, 2× 
