1
JEE Main 2024 (Online) 27th January Morning Shift
+4
-1

If the refractive index of the material of a prism is $$\cot \left(\frac{A}{2}\right)$$, where $$A$$ is the angle of prism then the angle of minimum deviation will be

A
$$\pi-2 \mathrm{~A}$$
B
$$\frac{\pi}{2}-2 \mathrm{~A}$$
C
$$\pi-\mathrm{A}$$
D
$$\frac{\pi}{2}-\mathrm{A}$$
2
JEE Main 2024 (Online) 27th January Morning Shift
+4
-1

Identify the physical quantity that cannot be measured using spherometer :

A
Radius of curvature of concave surface
B
Specific rotation of liquids
C
Thickness of thin plates
D
Radius of curvature of convex surface
3
JEE Main 2024 (Online) 27th January Morning Shift
+4
-1

A convex lens of focal length $$40 \mathrm{~cm}$$ forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length $$20 \mathrm{~cm}$$. The photoelectric current now is :

A
$$\mathrm{\frac{I}{2}}$$
B
4 I
C
2 I
D
I
4
JEE Main 2023 (Online) 13th April Morning Shift
+4
-1

A vessel of depth '$$d$$' is half filled with oil of refractive index $$n_{1}$$ and the other half is filled with water of refractive index $$n_{2}$$. The apparent depth of this vessel when viewed from above will be-

A
$$\frac{2 d\left(n_{1}+n_{2}\right)}{n_{1} n_{2}}$$
B
$$\frac{d\left(n_{1}+n_{2}\right)}{2 n_{1} n_{2}}$$
C
$$\frac{d n_{1} n_{2}}{2\left(n_{1}+n_{2}\right)}$$
D
$$\frac{d n_{1} n_{2}}{\left(n_{1}+n_{2}\right)}$$
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