Home
Class 10
PHYSICS
What is meant by power of a lens? Write...

What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of -20 cm . Write the nature and power of each lens.

Text Solution

AI Generated Solution

### Step-by-Step Solution: 1. **Definition of Power of a Lens**: - The power of a lens is defined as the degree to which it can converge (focus) or diverge (spread) light rays that are incident upon it. It indicates the ability of the lens to bend light. 2. **Formula for Power of a Lens**: - The power (P) of a lens is mathematically defined as: \[ ...
Promotional Banner

Similar Questions

Explore conceptually related problems

Define power of a lens. What is its unit ? One student uses a lens of focal length 50 cm and another of - 50 cm . What is the nature of the lens and power used by each of the them ?

What is meant by power of a lens? Define its S.I.unit. You have two lenes A and B of focal lengths + 10 cm and - 10 respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnigied image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.

Define power of a lens and write its unit

The power of a lens is -5 D. Find its focal length.

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined toghether. What will be their resulting power ?

What is the optical power in dioptre of a concave lens of focal length 50 cm?

A focal length of a lens 10cm. What is power of a lens in dipotre?

If the focal length of objective lens is increased then magnifying power of

An achromatic lens-doublet is formed by placing in contact a convex lens of focal length 20 cm and a concave lens of focal length 30 cm. The dispersive power of the material of the convex lens is 0.8. Determine the dispersive power of the material of the concave lens. Calculate the focal length of the lens-doublet.

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm . Is the system a converging or a diverging lens ? Ignore thickness of the lenses.