Ray Optics-Lens Formula [HBCSE Olympiads (Homi Bhabha Centre for Science Education) NSEP (Physics)]: Questions 1 - 2 of 2

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Question 1

Lens Formula

Appeared in Year: 2016

Question

MCQ▾

Two identical lenses made of the same material of refractive index have the focal length 12 cm. These are kept in contact and immersed in a liquid of refractive index . The combination behaves as –

Choices

Choice (4)Response

a.

Convex lens of focal length

b.

Convex lens of focal length

c.

Convex lens of focal length

d.

Convex lens of focal length

Question 2

Lens Formula

Question

MCQ▾

Consider a manual camera with a lens having a focal length of 5 cm. It is focused at infinity. For catching the picture of an object at a distance of 30 cm, one would

Choices

Choice (4)Response

a.

Find it impossible to catch the picture

b.

Move the lens out by about 1 cm

c.

Move the lens out by about 5 cm

d.

Move the lens in by about 1 cm