MCQ on Light Reflection and Refraction

Q1) When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:

(a) is doubled

(b) is halved

(c) becomes infinite

(d) remains same

Q2) If an object is placed symmetrically between two plane mirrors, inclined at angle of 72 degree, then total no. of images formed:

(a) 5

(b) 4

(c) 2

(d) infinite

Q3) Which statement is true for the reflection of light?

(a) The angle of incidence and reflection are equal.

(b) The reflected light is less bright than the incident light.

(c) The sum of angle of incidence and reflection is always greater than 900.

(d) The beams of incident light after reflection diverge at unequal angles.

Q4) Focal length of a plane mirror is

(a) 0

(b) infinite

(c) 25cm

(d) -25

Q5) The image shows the path of incident rays to a concave mirror.

Where would the reflected rays meet for the image formation to take place?

(a) behind the mirror

(b) between F and O

(c) between C and F

(d) beyond C

Q6) A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :

(a) parallel

(b) convergent

(c) divergent

(d) not certain

Q7) An object is placed at a distance of 40cm in front of a concave mirror of focal length 20cm.

The image produced is:

(a) virtual and inverted

(b) real and erect

(c) real, inverted and of the opposite size as that of the object

(d) real, inverted and of the same size as that of the object

Q8) A student conducts an experiment using a convex lens. He places the object at a distance of 60 cm in front of the lens and observes that the image is formed at a distance of 30 cm behind the lens. What is the power of the lens?

(a) 0.005 dioptre

(b) 0.05 dioptre

(c) 5 dioptre

(d) 50 dioptre

Q9) An image of an object produced on a screen which is about 36 cm using a convex lens. The image produced is about 3 times the size of the object. What is the size of the object?

(a) 12 cm

(b) 33 cm

(c) 39 cm

(d) 108 cm

Q10) Image formed by a convex spherical mirror is:

(a) virtual

(b) real

(c) enlarged

(d) inverted

Q11) A student studies that a convex lens always forms a virtual image irrespective of its position. What causes the convex mirror to always form a virtual image?

(a) because the reflected ray never intersects

(b) because the reflected ray converges at a single point

(c) because the incident ray traces its path back along the principal axis

(d) because the incident ray of a convex mirror gets absorbed in the mirror

Q12) A 10 mm long awl pin is placed vertically in front pin is formed at 30cm in front of the mirror. The focal length of this mirror is:

(a) -30cm

(b) -20cm

(c) -40cm

(d) -60cm

Q13) Rahul conducts an experiment using an object of height 10 cm and a concave lens with focal length 20 cm. The object is placed at a distance of 25 cm from the lens. Can the image be formed on a screen?

(a) yes, as the image formed will be real

(b) yes, as the image formed will be erect

(c) no, as the image formed will be virtual

(d) no, as the image formed will be inverted

Q14) Magnification produced by a rear view mirror fitted in vehicles:

(a) is less than one

(b) is more than one

(c) is equal to one

(d) can be more than or less than one depending upon the position of the object in front of it

Q15) A student conducts an activity using a concave mirror with focal length of 10 cm. He placed the object 15 cm from the mirror. Where is the image likely to form?

(a) at 6 cm behind the mirror

(b) at 30 cm behind the mirror

(c) at 6 cm in front of the mirror

(d) at 30 cm in front of the mirror

Q16) The image of an object placed in front of a convex mirror is formed at

(a) the object itself

(b) twice the distance of the object in front of the mirror

(c) half the distance of the object in front of the mirror

(d) behind the mirror

Q17) A full length of image of a distant tall building can definitely be seen using:

(a) a concave mirror

(b) a convex mirror

(c) a plane mirror

(d) both concave as well as plane mirror

Q18) A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed is 45 cm in height. What is the magnification of the image?

(a) -3 times

(b) -1/ 3 times

(c) 1/ 3 times

(d) 3 times

Q19) Which of the following can make a parallel beam of light from a point source incident on it?

(a) concave mirror as well as convex lens

(b) convex mirror as well as concave lens

(c) two plane mirrors placed at 90degree to each other

(d) concave mirror as well as concave lens

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Q20) A student studies that the speed of light in air is 300000 kms/ sec where that of speed in a glass slab is about 197000 kms/ sec. What causes the difference in speed of light in these two media?

(a) difference in density

(b) difference in temperature

(c) difference in amount of light

(d) difference in direction of wind flow