1
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

The property of light used in optical fibre cables is

A
total internal reflection
B
refraction
C
interference
D
polarisation
2
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

Two plane mirrors A and B are aligned parallel to each other as shown in the figure.

BITSAT 2021 Physics - Ray Optics Question 8 English

A ray of light is incident at an angle 30$$^\circ$$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times, the ray undergoes reflection (excluding the first one) before it emerges out is

A
28
B
34
C
30
D
29
3
BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

A thin equi-convex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m. If it acts as a concave lens of focal length 0.5 cm when dipped in a liquid, the refractive index of the liquid is

A
$${{17} \over 8}$$
B
$${{15} \over 8}$$
C
$${{13} \over 8}$$
D
$${{9} \over 8}$$
4
BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

A spherical lens of power $$-$$4D is placed at a distance of 15 cm from another spherical lens of power 5 D. A beam of parallel light falls on the first spherical lens. The final image formed is

A
real and at a distance of 40 cm from the lens of power 5 D
B
real and at a distance of 10 cm from the lens of power $$-$$4 D
C
virtual and at a distance of 40 cm from the lens of power $$-$$5 D
D
None of the above
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