1
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

When one light ray is reflected from a plane mirror with $$30^{\circ}$$ angle of reflection, the angle of deviation of the ray after reflection is :

A
$$140^{\circ}$$
B
$$130^{\circ}$$
C
$$120^{\circ}$$
D
$$110^{\circ}$$
2
JEE Main 2023 (Online) 11th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
$$3.12 \times 10^{7} \mathrm{~m} / \mathrm{s}$$
3
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
4
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
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