- 1(current)
Q. No.The earth takes \(24~\text{h}\) to rotate once about its axis. How much time does the sun take to shift by \(1^{\circ}\) when viewed from the earth?
1. \(3~\text{minutes}\)
2. \(2~\text{minutes}\)
3. \(1~\text{minutes}\)
4. \(4~\text{minutes}\)
Light from a point source in the air falls on a convex spherical glass surface (n = 1.5 and radius of curvature = 20 cm) of a glass medium which extends till infinity on other side . The distance of the light source from the glass surface is 100 cm. At what position the image is formed?
| 1. | at a distance of 200 cm from the glass surface, in the direction of incident light. |
| 2. | at a distance of 100 cm from the glass surface, in the direction of incident light. |
| 3. | at a distance of 200 cm from the glass surface, in the opposite direction of incident light. |
| 4. | at a distance of 100 cm from the glass surface, in the opposite direction of incident light. |
A magician during a show makes a glass lens with \(n=1.47\) disappear in a trough of liquid. What is the refractive index of the liquid?
1. \( 1.47 \)
2. \( 1.33 \)
3. \(0.66 \)
4. \( 1.5\)
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Q. No.
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