- 1(current)
Q. No.1. \(50\) cm
2. \(-50\) cm
3. \(-50/1.2\) cm
4. \(-50 \times1.2\) cm
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| 1. | greater for red than for violet. |
| 2. | greater for violet than for red. |
| 3. | the same for violet and red. |
| 4. | undefined, because the two colours of light interfere with each other. |
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| Statement I: | Chromatic aberration has different signs for concave and convex lenses. |
| Statement II: | Chromatic aberration is absent in mirrors. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
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| 1. | \(\dfrac14\) of that in air |
| 2. | \(\dfrac89\) of that in air |
| 3. | \(\dfrac98\) of that in air |
| 4. | \(4\) times that in air |
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| Assertion (A): | A convex lens made of glass \((\mu=1.5),\) when placed in a liquid of refractive index \(\mu=3,\) functions like a diverging lens. |
| Reason (R): | The focal length of the lens is determined by the expression: \({\large\frac{1}{f}}=(\mu_r-1){\large\Big(\frac{1}{R_1}-\frac{1}{R_2}\Big)}\) which depends on the relative refractive index of the material of the lens with respect to that of the external medium. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
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- 1(current)
Q. No.
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