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
Assertion (A): A red rose appears red in white light.
Reason (R): This is because it reflects all colours of light and absorbs red colour.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
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) secondary colours (d) Red rose (iv) plane mirror (e) Yellow, cyan and magenta (v) slows down What do you mean by the term reflection of light?