Reflection and Refraction MCQs | Reflection and Refraction of Light Multiple Choice Questions(MCQs) & Answers

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Questions
1 Focal length of plane mirror is
A At infinity
B Zero
C Negative
D None of these

Answer: At infinity
2 Image formed by plane mirror is
A Real and erect
B Real and inverted
C Virtual and erect
D Virtual and inverted

Answer: Virtual and erect
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3 A concave mirror gives real, inverted and same size image if the object is placed
A At F
B At infinity
C At C
D Beyond C

Answer: At C
4 Power of the lens is -40, its focal length is
A 4m
B -40m
C -0.25m
D -25m

Answer: -0.25m
5 A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
A At infinity
B Between F and C
C Between P and F
D At E

Answer: Between P and F
6 We can see objects because of_______
A reflection
B refraction
C transmission
D diffraction

Answer: reflection
7 Convex lens focus a real, point sized image at focus, the object is placed
A At focus
B Between F and 2F
C At infinity
D At 2F

Answer: At infinity
8 The unit of power of lens is
A Metre
B Centimeter
C Diopter
D M-1

Answer: Diopter
9 The refractive index of a rarer medium with respect to a denser medium is...
A 1
B Greater Than 1
C Smaller Than 1
D Negative

Answer: Smaller Than 1
10 The radius of curvature of a mirror is 20cm the focal length is
A 20cm
B 10cm
C 40cm
D 5cm

Answer: 10cm
11 The refractive index of a denser medium with respect to a rarer medium is...
A 1
B Greater Than 1
C Smaller Than 1
D Negative

Answer: Greater Than 1
12 A boy is standing at a distance of 2 m in front of a plane mirror.The distance between the boy and his image is ________ m.
A 4
B 3
C 2
D 1

Answer: 4
13 The incident ray passing through the focus(F) of a mirror ______ after reflection.
A Passes Through C
B Passes Through F
C Becomes Parallel To The Principal Axis
D Passes Through The Pole

Answer: Becomes Parallel To The Principal Axis
14 The optical phenomena, twinkling of stars, is due to
A Atmospheric reflection
B Total reflection
C Atmospheric refraction
D Total refraction

Answer: Atmospheric refraction
15 In optics an object which has higher refractive index is called
A Optically rarer
B Optically denser
C Optical density
D Refractive index

Answer: Optically denser
16 Which of the following is a true statement?
A The power of a lens is always positive
B The power of a lens is always negative
C The power of a convex lens is positive
D The power of a concave lens is positive

Answer: The power of a convex lens is positive
17 Absolute refractive index of any medium is always _______.
A 1
B > 1
C < 1
D 0

Answer: > 1
18 According to the sign convention, the distance of object...
A Is always positive
B Is always negative
C May be positive or negative
D Is equal to object height

Answer: Is always negative
19 If magnification is +1.5, the image is______.
A Erect
B Diminished
C Real
D Inverted

Answer: Erect
20 The speed of light is_______ in vacuum.
A 3 x 105 m/s
B 3 x 108 m/s
C 3 x 108 km/s
D 3 x 106 m/s

Answer: 3 x 108 m/s

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