Physicshard · Past Paper
The power of a lens is -2.0 D. What is its focal length?
A50 cm
B-50 cm
C20 cm
D-20 cm
✓ Correct Answer: B — -50 cm
f = 1/P = 1/(-2) = -0.5 m = -50 cm.
Share this question
More from Physics
- The ability of the eye lens to adjust its focal length is called:
- Scattering of light by colloidal particles is known as:
- An object is placed 10 cm in front of a concave mirror of focal length 15 cm. The image formed is:
- If a body is taken from Earth to the Moon, its mass:
- If a man weighs 600 N on Earth, what will be his approximate weight on the Moon?