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 so that the light coming from it first passes through the lens, the gets reflected from the mirror, again passes through the lens to form an inverted image coincident with the object itself. Determine the position of the object.
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A point object O is placed at a distance of 60 cm from a concave mirror of radius of curvature 80 cm. (a) At what distance from the concave mirror sho
Correct Answer - (a) 90 cm (b) No.
2 Answers 3 views
A small object of height h is placed perpendicular to the principal axis of a convex mirror of focal length f at a distance x from the pole of the mir
Correct Answer - (a) `alpha = (h)/(L+ x + (Lx)/(f))` (b) `beta = (h)/(L +x)`
2 Answers 1 views
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
2 Answers 1 views
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
Correct Answer - 8 cm
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 `1cm^(2)` face area is placed at a distance of 1.5m from a screen. How far from the object should a concave mirror be placed so that it f
Correct Answer - `-1.5m, -1m`
2 Answers 5 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