Question

A convex lens has a focal length of 40cm. Calculate its power. ​

Answer 1

Answer:

Explanation:

Hey user !

So here's u r answer !

↪Focal length -> 40 cm

↪P = 1 / F (in m)  

↪P = 1 / 0.4 m

↪P = + 2 . 5D

Hope it is satisfactory !!

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looking cute in the dp...................

Answer 2

Power of convex lens with focal length 40cm.

What is convex lens?

• Convex lens is a spherical refracting lens which is wider in the middle and narrow at the edges.
• Images formed through convex lens are real as well as virtual.
• It converges the light rays incident on the lens.
• Power of a convex lens is the measure of converging degree of the lens.
• Power is reciprocal of focal length of lens.
• Convex lens has positive power because the focal length is positive.

Power = 1/focal length = 1/0.04 = 25 D.