Chapter 19 – Optical Instruments
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The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the longitudinal chromatic aberration of the lens?
15
Nov
The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the longitudinal chromatic aberration of the lens? The dispersive power of material of a lens of focal length 20 cm is 0.08. What is the longitudinal chromatic aberration of the lens? November 15, 2020 Category: Cengage NEET by [...]
The dispersive powers of crown and flint glasses are 0.02 and 0.04 respectively. In an achromatic combination of lenses the focal length of flint glass lens is 40cm. The focal length of crown glass lens will be
15
Nov
The dispersive powers of crown and flint glasses are 0.02 and 0.04 respectively. In an achromatic combination of lenses the focal length of flint glass lens is 40cm. The focal length of crown glass lens will be An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a [...]
An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively.
15
Nov
An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their focal lengths must be respectively. An achromatic convergent system of focal length +20cm is made of two lenses (in contact) of materials having dispersive powers in the ratio 1:2. Their [...]
An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is
15
Nov
An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal [...]
The near point of a person is 50cm and the far point is 1.5 m. The spectacles required for reading purpose and for seeing distant objects are respectively
15
Nov
The near point of a person is 50cm and the far point is 1.5 m. The spectacles required for reading purpose and for seeing distant objects are respectively The near point of a person is 50cm and the far point is 1.5 m. The spectacles required for reading purpose and for seeing distant objects are [...]
A far-sighted man can see clearly at a distance of 1.0m. The power of the lens that would make him see clearly at a distance of 0.2m is
15
Nov
A far-sighted man can see clearly at a distance of 1.0m. The power of the lens that would make him see clearly at a distance of 0.2m is A far-sighted man can see clearly at a distance of 1.0m. The power of the lens that would make him see clearly at a distance of 0.2m [...]
A person wears glasses of power −2.5D. The defect of the eye and the far point of the person without the glasses are, respectively
15
Nov
A person wears glasses of power −2.5D. The defect of the eye and the far point of the person without the glasses are, respectively A person wears glasses of power −2.5D. The defect of the eye and the far point of the person without the glasses are respectively November 15, 2020 Category: Cengage NEET by [...]
A person whose far-point is at 30cm wants to read at 50cm. The power of the lens should be
15
Nov
A person whose far-point is at 30cm wants to read at 50cm. The power of the lens should be A person whose far-point is at 30cm wants to read at 50cm. The power of the lens should be November 15, 2020 Category: Cengage NEET by C.P Singh , Chapter 19 - Optical Instruments , Part [...]
A man, wearing glasses of power + 2D can read clearly a book placed at a distance of 40 cm from the eye. The power of the lens required so that he can read at 25cm from the eye is
15
Nov
A man, wearing glasses of power + 2D can read clearly a book placed at a distance of 40 cm from the eye. The power of the lens required so that he can read at 25cm from the eye is A man wearing glasses of power + 2D can read clearly a book placed at [...]
They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wave length of light =500 nm]
15
Nov
They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wave length of light =500 nm] They are viewed by eye of pupil diameter 3 mm. Approximately what is the maximum distance at which these dots can be [...]