A normal eye is not able to see objects closer than \(25~\text{cm}\) because:
1. | the focal length of the eye is \(25~\text{cm}.\) |
2. | the distance of the retina from the eye lens is \(25~\text{cm}.\) |
3. | the eye is not able to decrease the distance between the eye lens and the retina beyond a limit. |
4. | the eye is not able to decrease the focal length beyond a limit. |
When objects at different distances are seen by the eye, which of the following remain constant?
1. The focal length of the eye-lens
2. The object-distance from the eye-lens
3. The radii of curvature of the eye-lens
4. The image-distance from the eye-lens
A person A can clearly see objects between 25 cm and 200 cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameters of eye identical to that of A?
1. 25 cm to 200 cm
2. 18 cm to 200 cm
3. 25 cm to 300 cm
4. 18 cm to 300 cm
The focal length of a normal eye-lens is about
1. 1 mm
2. 2 cm
3. 25 cm
4. 1 m
The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens
1. = x
2. < x
3. > x
4. = 2x
A man wearing glasses of focal length +1m cannot clearly see beyond 1 m
1. if he is farsighted
2. if he is nearsighted
3. if his vision is normal
4. in each of these cases
An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends
1. on f but not on u
2. on u but not on f
3. on f as well as u
4. neither on f nor on u
To increase the angular magnification of a simple microscope, one should increase:
1. | the focal length of the lens | 2. | the power of the lens |
3. | the aperture of the lens | 4. | the object size |
A man is looking at a small object placed at his near point. Without alternating the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is
1. 5
2. 2.5
3. 1
4. 0.2
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When we see an object, the image formed on the retina is
(a) real
(b) virtual
(c) erect
(d) inverted
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 306662
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 306662