An object is kept at infinity from a concave lens of focal length 20 cm. What is the image distance?
A. 10 cm
B. 15 cm
C. 20 cm
D. Infinity
Answer:C
An object is kept at infinity from a concave lens of focal length 20 cm. What is the image distance?
A. 10 cm B. 15 cm C. 20 cm D. Infinity