Question

Fill in the Blanks
"1. Light shows the phenomena of reflection, refraction and ………. .
2. The speed of light in vacuum is ………. .
3. Power of’ a lens is the ………. of its focal length.
4. The SI unit of power is ………. .
5. A ………. lens will always give a virtual, erect and diminished image, irrespective of the position of the object.
6. A positive sign in the value of magnification indicates that the image is ………. .
7. A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
8. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be ………. ."

Answer 1

Answer:

1. Dispersion
2. 3x10⁸m/sec
3. reciprocal
4. Watt
5. Concave
6. Virtual
7. Concave
8. Convex

Explanation:

"1. Light shows the phenomena of reflection, refraction and dispersion.

2. The speed of light in vacuum is . .3x10⁸m/sec

3. Power of’ a lens is the reciprocal of its focal length.

4. The SI unit of power is Watt .

5. A concave lens will always give a virtual, erect and diminished image, irrespective of the position of the object.

6. A positive sign in the value of magnification indicates that the image is virtual.

7. A concave mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.

8. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be convex ."

Answer 2

1. Light shows the phenomena of reflection, refraction and diffraction.

2. The speed of light in a vacuum is 3×10⁸m/s.

3. Power of a lens is the reciprocal of its focal length.

4. The SI unit of power is Dioptre (D).

5. A concave lens will always give a virtual, erect and diminished image, irrespective of the position of the object.

6. A positive sign in the value of magnification indicates that the image is

erect.

7. A concave mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.

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