1
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

Light travels a distance $$\mathrm{x}$$ in time $$t_{1}$$ in air and $$10 \mathrm{x}$$ in time $$t_{2}$$ in another denser medium. What is the critical angle for this medium?

A
$$\sin ^{-1}\left(\frac{10 \mathrm{t}_{2}}{\mathrm{t}_{1}}\right)$$
B
$$\sin ^{-1}\left(\frac{t_{1}}{10 t_{2}}\right)$$
C
$$\sin ^{-1}\left(\frac{10 t_{1}}{t_{2}}\right)$$
D
$$\sin ^{-1}\left(\frac{t_{2}}{t_{1}}\right)$$
2
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin) ?

NEET 2023 Physics - Geometrical Optics Question 9 English

A
$$-40 \mathrm{~cm}$$
B
$$-100 \mathrm{~cm}$$
C
$$-50 \mathrm{~cm}$$
D
$$40 \mathrm{~cm}$$
3
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

Two thin lenses are of same focal lengths $$(f)$$, but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be :

A
$$f / 4$$
B
$$f / 2$$
C
Infinite
D
Zero
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

During a cloudy day, a primary and a secondary rainbow may be created, then the :

A
secondary rainbow is due to single internal reflection and is formed above the primary one.
B
primary rainbow is due to double internal reflection and is formed above the secondary one.
C
primary rainbow is due to double internal reflection and is formed below the secondary one.
D
secondary rainbow is due to double internal reflection and is formed above the primary one.
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