Question

two convex lenses of different focal length are placed at the distance apart equal to the sum of their focal length the power of the lens combination will be

a 0

b 1

c 2

d 4​

Answer 1

Answer:

2......................

Answer 2

The correct answer is option (c.) 2.

Explanation:

• Two convex lenses of different focal length are placed at the distance apart equal to the sum of their focal length the power of the lens combination will be 2.
• The convex lens is a lens that converges rays of light that convey parallel to its principal axis.
• It is used in eyeglasses for correcting farsightedness, where the distance between the eye's lens and retina is too short which results that the focal point lies behind the retina.
• Eyeglasses with convex lenses can increase refraction, and accordingly reduces the focal length.