basic MCQ on the basis of ray optics:-
Its a 15 MCQ question there is four option, and one of the options is correct, Its a very easy question on basic knowledge on Ray optics.....
(1)A ray of light enters from denser to rarer medium then-
(a) energy increases
(b) frequency increases
(c) phase changes by 90°
(d) velocity increases
Ans-d
(2)To get three images of a single object, one should have two plane mirrors at an angle of-
(a) 30° (b)90° (c)120° (d)150°
Ans-b
(3)Which of the following is not due to total internal reflection ?
(a) Working of optical fibre
(b) Difference between aparent and real depth of a pond
(c) Mirage on hot summer days
(d) Brilliance of diamond
Ans-b
(4)An object is situated at a distance of f/2 from a convex mirror of focal length f. Distance of image will be-
(a) +f
(b) +(f/3)
(c)-f
(d)-2f
Ans-b
(5) Ten identical converging thin lenses, each of focal length 10 cm, are in contact. What is the power
of the combined lens-
(a) 10D
(b) 100D
(c) 1000D
(d) 1D
Ans-b
(6)A convex lens of focal length 10 cm is placed in contact with a convex lens of 15 cm focal length What is the focal length of the combination -
(a) 6cm (b) 12cm (c) 15cm (d) 10cm
Ans-a
(7) A biconvex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be -
(a) f (b) 2f (c) f/2 (d) 3f
Ans- b
(8) A plano-convex lens is made of flint glass. Its focal length is
(a) inversely proportional to the wavelength of light
(b) longer for red than for blue
(c) longer for blue than for red
(d) same for all colours
Ans-b
(9) what will be the colour of sky as seen from the moon in day time?
(a) white (b) blue
(c) red (d) black
Ans-d
(10) Rainbow is caused due to-
(a) refraction
(b) dispersion
(c) reflection
(d) all of these
Ans-d
(11) Phenomena associated with scattering are-
(a) the blue colour of the sky
(b) the appearance of the reddish sun during sunset and sunrise
(c) both (a ) and (b)
(d)None
Ans-c
(12) for a normal eye, the least distance of distinct vision is-
(a) 25m (b) 25cm
(c) 10cm (d) 25dm
Ans-b
(13) Image formed on the retina is
(a) real and erect
(b) virtual and inverted
(c) real and inverted
(d) virtual and erect
Ans-c
(14) The apparent flattening of the sun at sunset and sunrise is due to
(a) refraction
(b) diffraction
(c) total internal reflection
(d) scattering
Ans-a
(15) When a ray undergoes refraction-
(a) its frequency changes
(b) its amplitude changes
(c) its velocity changes
(d) both amplitude and frequency changes
Ans-c
If you want more This type of question, you can comment in the comment box.
Thank You all of you.....
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