1
JEE Main 2023 (Online) 11th April Morning Shift
+4
-1

The critical angle for a denser-rarer interface is $$45^{\circ}$$. The speed of light in rarer medium is $$3 \times 10^{8} \mathrm{~m} / \mathrm{s}$$. The speed of light in the denser medium is:

A
$$2 .12 \times 10^{8} \mathrm{~m} / \mathrm{s}$$
B
$$5 \times 10^{7} \mathrm{~m} / \mathrm{s}$$
C
$$\sqrt{2} \times 10^{8} \mathrm{~m} / \mathrm{s}$$
D
$$3.12 \times 10^{7} \mathrm{~m} / \mathrm{s}$$
2
JEE Main 2023 (Online) 10th April Morning Shift
+4
-1

An object is placed at a distance of 12 cm in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by 4 cm towards the stationary object. The distance by which the position of image would be shifted, will be

A
4 cm towards mirror
B
2 cm towards mirror
C
8 cm away from mirror
D
8 cm towards mirror
3
JEE Main 2023 (Online) 8th April Morning Shift
+4
-1

In a reflecting telescope, a secondary mirror is used to:

A
make chromatic aberration zero
B
remove spherical aberration
C
reduce the problem of mechanical support
D
move the eyepiece outside the telescopic tube
4
JEE Main 2023 (Online) 6th April Evening Shift
+4
-1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: The phase difference of two light waves change if they travel through different media having same thickness, but different indices of refraction.

Reason R: The wavelengths of waves are different in different media.

In the light of the above statements, choose the most appropriate answer from the options given below

A
Both A and R are correct but R is NOT the correct explanation of A
B
A is correct but R is not correct
C
A is not correct but R is correct
D
Both A and R are correct and R is the correct explanation of A
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