Physics
Match the following:
| Column A | Column B |
|---|---|
| (a) A light ray passes from air to glass | (i) speeds up |
| (b) A light ray passes from glass to water | (ii) reflects red light |
| (c) Virtual image | (iii) primary colours |
| (d) Red rose | (iv) plane mirror |
| (e) Red, green and blue | (v) slows down |
Related Questions
Write true or false for each statement:
(a) The image formed by a plane mirror is real.
(b) When a light ray is reflected from a wall, the angle of incidence is not equal to the angle of reflection.
(c) The image of the right hand in a plane mirror looks like that of a left hand.
(d) The image formed by a plane mirror is upright.
(e) The image formed by a plane mirror can be obtained on a screen.
(f) The objects around us are seen due to irregular reflection of light.
(g) The speed of light in vacuum is 3 x 108 m s-1.
(h) A rose appears red in light of all the colours.
(i) A black paper absorbs light of all the colours and reflects none.
(j) The primary colours are red, blue and green.
Fill in the blanks:
(a) Angle of incidence = ……………
(b) The incident ray, the reflected ray and the normal lie ……………
(c) The image formed by a plane mirror is at a distance behind the mirror as …………… .
(d) The image formed by a plane mirror is …………… and …………… .
(e) We are able to see the objects around us due to …………… reflection.
(f) A …………… image cannot be obtained on a screen.
(g) One surface of mirror is made opaque by …………… it followed by a thin coating of paint of lead oxide.
(h) A plane mirror …………… reflect 100 percent light falling on it.
(i) The colour of an opaque object is the colour of light which it …………… .
(j) Magenta, cyan and yellow are the …………… colours.
A man standing in front of a plane mirror finds his image to be at a distance of 6 metre from himself. The distance of man from the mirror is:
- 6 m
- 3 m
- 2 m
- 12 m
The angle between the incident ray and the ray reflected from the plane mirror is 70°. The angle of incidence will be:
- 70°
- 30°
- 35°
- 90°