1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Curved surfaces of a plano-convex lens of refractive index $$\mu$$1 and a plano-concave lens of refractive index $$\mu$$2 have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.

JEE Main 2021 (Online) 27th August Evening Shift Physics - Geometrical Optics Question 86 English
A
$${1 \over {{\mu _2} - {\mu _1}}}$$
B
$${\mu _1} - {\mu _2}$$
C
$${1 \over {{\mu _1} - {\mu _2}}}$$
D
$${\mu _2} - {\mu _1}$$
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
An object is placed beyond the centre of curvature C of the given concave mirror. If the distance of the object is d1 from C and the distance of the image formed is d2 from C, the radius of curvature of this mirror is :
A
$${{2{d_1}{d_2}} \over {{d_1} - {d_2}}}$$
B
$${{2{d_1}{d_2}} \over {{d_1} + {d_2}}}$$
C
$${{{d_1}{d_2}} \over {{d_1} + {d_2}}}$$
D
$${{{d_1}{d_2}} \over {{d_1} - {d_2}}}$$
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Find the distance of the image from object O, formed by the combination of lenses in the figure :

JEE Main 2021 (Online) 27th August Morning Shift Physics - Geometrical Optics Question 87 English
A
75 cm
B
10 cm
C
20 cm
D
infinity
4
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Car B overtakes another car A at a relative speed of 40 ms$$-$$1. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when the car B is 1.9 m away from the car A?
A
4 ms$$-$$1
B
0.2 ms$$-$$1
C
40 ms$$-$$1
D
0.1 ms$$-$$1
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