Question

one student uses a lens of focal length 50 cm and another-50 cm. what is the nature of the lens used by each of them?​

Answer 1

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If the focal length is in positive value it is convex lens & if it is negative it is concave lens.

So, the lens of -50cm focal length is a concave & the other one is convex lens.

Powers

1). f=-50cm= -0.5m

p= 1/f = 1/(-0.5) = -10/5

p= -2D

2). f= 50cm = 0.5m

Similarity, it's also 2D but it is positive, as minus is not here.

(mark me in brainliest answer please and thanks please)

Answer 2

Answer:

If the focal length is in positive value it is convex lens & if it is negative it is concave lens. So, the lens of -50cm focal length is a concave & the other one is convex lens.