1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
A ray of light entering from air into a denser medium of refractive index $${4 \over 3}$$, as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle $$\theta$$ should be equal to :

JEE Main 2021 (Online) 25th July Evening Shift Physics - Geometrical Optics Question 86 English
A
$${\sin ^{ - 1}}{{\sqrt 7 } \over 3}$$
B
$${\sin ^{ - 1}}{{\sqrt 5 } \over 4}$$
C
$${\sin ^{ - 1}}{{\sqrt 7 } \over 4}$$
D
$${\sin ^{ - 1}}{{\sqrt 5 } \over 3}$$
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
A ray of laser of a wavelength 630 nm is incident at an angle of 30$$^\circ$$ at the diamond-air interface. It is going from diamond to air. The refractive index of diamond is 2.42 and that of air is 1. Choose the correct option.
A
angle of refraction is 24.41$$^\circ$$
B
angle of refraction is 30$$^\circ$$
C
refraction is not possible
D
angle of refraction is 53.4$$^\circ$$
3
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
A ray of light passes from a denser medium to a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90$$^\circ$$ with each other. The angle of reflection and refraction are respectively r and r'. The critical angle is given by

JEE Main 2021 (Online) 22th July Evening Shift Physics - Geometrical Optics Question 90 English
A
sin$$-$$1 (tan r)
B
sin$$-$$1 (cot r)
C
sin$$-$$1 (tan r')
D
tan$$-$$1 (sin i)
4
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Region I and II are separated by a spherical surface of radius 25 cm. An object is kept in region I at a distance of 40 cm from the surface. The distance of the image from the surface is :

JEE Main 2021 (Online) 20th July Morning Shift Physics - Geometrical Optics Question 92 English
A
55.44 cm
B
18.23 cm
C
9.52 cm
D
37.58 cm
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