Question

Optics.

l. Choose the Correct Answer;

1) Colour of light that has maximum frequency is______.
a) violet. b) red. c) green. d) blue.
2) In Optics an object which has higher refractive index is called______.
a) Optically rarer. b) Optically denser.
c) Optical density. d) Refractive index.
3) Ramu is given three media A, B and C of restrictive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is______.
a) A. b) B. c) C. d) equal in all three media.
4)By convention, the power of a concave lens is______.
a) Real. b) Virtual. c) Positive. d) Negative.
5) The condition in which lines in one direction appear to be well focused while those in perpendicular direction appear distorted is known as_______.
a) Presbyopia. b) Myopia. c) Hypermetropia. d) Astigmatism.

ll. Short Answer;

6) State Snell's laws.
7) Define dispersion of light.
8) Differentiate convex lens and concave lens.
9) Write any two application of convex lenses.

III. Write in Detail;

10) List any five properties of light. ​

Answer 1

Answer:

10) The properties of light are:

• Light is a form of energy.

• Light always travels along a straight line.

• Light does not need any medium for its propagation.

• Light can even travel through a vacuum.

• Light in different colours has different wavelengths and frequencies.