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Consider the following statements about mirrors:
1. The radius of curvature of a spherical mirror is twice its focal length.
2. Convex mirrors are used as rear-view mirrors because they always give an erect, diminished image and a wider field of view.
3. The image formed by a plane mirror is real and erect.
Which of the statements given above is/are correct?
Match List-I with List-II.
| List-I (Eye condition) | List-II (Correction) |
|---|---|
| A. Myopia | 1. Bifocal lens |
| B. Hypermetropia | 2. Convex lens |
| C. Presbyopia | 3. Surgery |
| D. Cataract | 4. Concave lens |
Select the correct answer using the codes given below.
A concave lens has a focal length of 0.25 m. What is its power?
Consider the following statements about refraction:
1. According to Snell's law, sin i / sin r is a constant for a given pair of media.
2. Diamond has a refractive index of 1.42.
3. The speed of light in vacuum is \(3 \times 10^{8}\) m/s.
Which of the statements given above is/are correct?
Arrange the following parts of the human eye in the order in which light entering the eye reaches them:
1. Retina
2. Cornea
3. Eye lens
4. Pupil
Select the correct sequence using the codes given below.
Match List-I with List-II.
| List-I (Observation) | List-II (Cause) |
|---|---|
| A. Twinkling of stars | 1. Dispersion |
| B. Blue colour of the sky | 2. Lateral inversion |
| C. Formation of a rainbow | 3. Atmospheric refraction |
| D. Left-right reversal of an image in a plane mirror | 4. Scattering |
Select the correct answer using the codes given below.
Consider the following statements:
1. Because of atmospheric refraction, the Sun is visible about 2 minutes before actual sunrise.
2. Planets twinkle more than stars because they are nearer to the Earth.
3. Danger signal lights are red because red light is scattered the least by fog or smoke.
Which of the statements given above is/are correct?
Consider the following statements about dispersion:
1. When white light passes through a prism, red light bends the most.
2. A rainbow always forms in the direction opposite to the Sun.
Which of the statements given above is/are correct?
Consider the following statements about the laws of reflection:
1. The angle of incidence is equal to the angle of reflection.
2. The incident ray, the normal and the reflected ray all lie in the same plane.
Which of the statements given above is/are correct?
Consider the following statements:
1. The image formed by a plane mirror is of the same size as the object.
2. In a spherical mirror, the focus lies at the centre of curvature.
Which of the statements given above is/are correct?
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