Question

4. You are given three lenses i) A concave lens of focal length 25 cm ii) A convex lens of focal length ¼ m iii) A convex lens of focal length 100cm Which combination out of these three lenses will form a lens of zero power?

Answer 1

Answer:

Concave lense of 25 cm and convex lens of 1/4 m

Because 1/4 m = 25cm

Concave lens is -25 and convex lens is +25

+25+(-25)=0

Hope you have understood