Physics
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.
Reflection of Light
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Answer
(a) False
Correct Statement — The image formed by a plane mirror is virtual.
(b) False
Correct Statement — When a light ray is reflected from a wall, the angle of incidence is equal to the angle of reflection.
(c) True
(d) True
(e) False
Correct Statement — The image formed by a plane mirror cannot be obtained on a screen.
(f) True
(g) True
(h) False A rose appears red in white light. Correct Statement —
(i) True
(j) True
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Related Questions
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.
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 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°