Ray Optics-Lens Maker's Formula and Lens Formula (NEET Physics): Questions 18 - 19 of 19

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Question number: 18

» Ray Optics » Lens Maker's Formula and Lens Formula

Appeared in Year: 2016

MCQ▾

Question

A person can see clearly object only when they lie between 50cm and 400cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be:

Choices

Choice (4) Response

a.

Convex, +0.15 diopter

b.

Concave, 0.2 diopter

c.

Convex, +2.25 diopter

d.

Concave, 0.25 diopter

Question number: 19

» Ray Optics » Lens Maker's Formula and Lens Formula

Appeared in Year: 2016

MCQ▾

Question

Two identical glass (μg=32) equiconvex lenses of focal length f each are kept in contact. The space between that two lenses in filled with water (μw=43) . The focal length of the combination is –

Choices

Choice (4) Response

a.

f

b.

3f4

c.

4f3

d.

f3

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