An object is placed `12 cm` to the left of a diverging lens of focal length `-6.0 cm.` A converging lens with a focal length of `12.0 cm` is placed at a distance d to the right of the diverging lens. Find the distance d that corresponds to a final image at infinity.
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An eye-piece consists of a concave lens of focal length 2f and a convex lens of focal length 3f separted by a distance `(f)/(2)`. They are of the same
Correct Answer - Free from chromatic aberration but not spherical, yes
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Two thin converging lenses of focal length `0.05`m are separted by a distance of `0.03`m. Find the focal length of the eye-piece and determine wheathe
Correct Answer - `0.036`m , positive, no
2 Answers 1 views
An object is placed 20 cm to the left of a convex lens of focal length 10 cm. If a concave mirror of focal length 5cm is placed 30 cm to the right of
Correct Answer - The image coincides with the object
2 Answers 1 views
A concave lens of focal length 20 cm is placed 15 cm in front of a concave mirror of radius of curvature 26 cm and further 10 cm away from the lens is
Correct Answer - 140 cm in front of the lens
2 Answers 9 views
A convex lens of focal length `15 cm` is placed in front of a convex mirror. Both are coaxial and the lens is `5 cm` from the apex of the mirror. When
Correct Answer - 55 cm
2 Answers 1 views
An object of height 4 cm is kept to the left of and on the axis of a converging lens offocal length 10cm at a distance of 15cm from lens. A plane mirr
Correct Answer - 20 cm from the mirror, 8 cm
2 Answers 1 views
A concave lens focal length 10 cm is placed on the axis of concave mirror of 10 cm radius at a distance of 5 cm from the mirror. An object is placed s
Correct Answer - 10 cm from the lens
2 Answers 1 views
A compound lens has been formed by joinined a convex and a concave lens, each of focal length 30 cm. what is the focal length of the combination? What
Correct Answer - Infinite, zero
2 Answers 1 views
Find the focal length and power of a convex lens, which when placed in contact with a concave lens of focal length `25 cm` forms a real image `5` time
Correct Answer - 10 cm, 10D
2 Answers 1 views
The power of a thin convex lens of glass is `5 dioptre`. When it is immersed in a liquid of refractive index `mu`, it behave like a diverging lens of
Correct Answer - `5//3`
2 Answers 1 views