1
JEE Main 2024 (Online) 31st January Morning Shift
+4
-1

The refractive index of a prism with apex angle $$A$$ is $$\cot A / 2$$. The angle of minimum deviation is :

A
$$\delta_m=180^{\circ}-3 \mathrm{~A}$$
B
$$\delta_m=180^{\circ}-4 A$$
C
$$\delta_m=180^{\circ}-2 A$$
D
$$\delta_m=180^{\circ}-A$$
2
JEE Main 2024 (Online) 29th January Evening Shift
+4
-1

If the distance between object and its two times magnified virtual image produced by a curved mirror is $$15 \mathrm{~cm}$$, the focal length of the mirror must be:

A
$$-10$$ cm
B
$$-12$$ cm
C
15 cm
D
10/3 cm
3
JEE Main 2024 (Online) 29th January Morning Shift
+4
-1

A convex mirror of radius of curvature $$30 \mathrm{~cm}$$ forms an image that is half the size of the object. The object distance is :

A
$$-$$45 cm
B
$$-$$15 cm
C
45 cm
D
15 cm
4
JEE Main 2024 (Online) 29th January Morning Shift
+4
-1

A biconvex lens of refractive index 1.5 has a focal length of $$20 \mathrm{~cm}$$ in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

A
$$-$$16 cm
B
+16 cm
C
+160 cm
D
$$-$$160 cm
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