Home
Class 10
PHYSICS
Explain why does a concave lens diverges...

Explain why does a concave lens diverges the rays of light falling on it.

Text Solution

Verified by Experts

(1) A concave lens can be regarded as made of a very large number of portions of triangular prisms. The bases of these prisms are towards the edges of the less, i.e, away from the central thinner portion of the lens.
(2) A ray of light passing through a prism bends towards its base. Hence, a concave lens diverges the rays of light falling on it.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Distinguish between|6 Videos

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Paragraph|5 Videos

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Answer the following questions :|145 Videos

  • LAWS, RULES, UNITS AND DEFINITIONS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Carbon Compounds|18 Videos

  • MAKING CONCEPT DIAGRAMS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Cell Biology and Biotechnology|2 Videos

Similar Questions

Explore conceptually related problems

A convex lens converges the rays of light falling on it.

A convex lens converges the rays of light falling on it.

A concave lens diverges the rays of light falling on it. Give reason

Why does a convex lens converge the light rays?

Power of a lens is a measure of the ability of the lens to converge the rays of light falling on it. Quantitatively, power of a lens = reciprocal of focal length of lens, i.e., P=(1)/(f) . If a lens happens to diverge the ray of light falling on it, its power is said to be negative. Thus, power of a convex lens is positive and power of a concave lens is negative. If P_1,P_2 are powers of two lenses held in contact with each other, the power of the combination is P=P_1+P_2 . Note that P_1,P_2 are to be added with proper sign. Read the above passage and answer the following question: (i) What is the SI unit of power? (ii) Focal length of a concave lens is 20 cm . What is its power ? (iii) What lessons of life do you learn from the relation P=P_1+P_2 ?

a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the princple axis, optical center, principle focus and focal length of the convex lens on the diagram. b) State whether concave lens and convex lens mirror have in common.

The power of a lens is defined as the tangent of the angle by which it converges or diverges a beam of light falling at unit distant from the optical centre.

Why is a concave lens called a diverging lens?

Does a concave lens have a real or a virtual focus?

When does a convex lens behave as a concave lens ?

Home
Profile