Question

If two lenses of powers of +10 D and – 6 D are put in contact, then what will be the equivalent power of their combination?

a) + 16 D

b) – 16 D

c) + 4 D

d) – 4 D

Magnification in a concave lens is -

a) Always negative and less than -1

b) Always positive and greater than 1

c) Always positive and less than 1

d) Always negative and greater than -1

A magnifying glass is a -

a) Concave lens of long focal length

b) Concave lens of short focal length

c) Convex lens of long focal length

d) Convex lens of short focal length​

Answer 1

Answer:

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