MEDIUM
JEE Main
IMPORTANT
Earn 100
Let the refractive index of a denser medium with respect to rarer medium be and its critical angle be . At an angle of incidence when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is . Angle is given by
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Important Questions on Ray Optics
MEDIUM
JEE Main
IMPORTANT
In an experiment a convex lens of focal length is placed coaxially on an optical bench in front of a convex mirror at a distance of from it. It is found that an object and its image coincide, if the object is placed at a distance of from the lens. The focal length of the convex mirror is-
MEDIUM
JEE Main
IMPORTANT
To find the focal length of a convex mirror, a student records the following data:
| Object pin | Convex Lens | Convex Mirror | Image Pin |
| 22.2 cm | 32.2 cm | 45.8 cm | 71.2 cm |
HARD
JEE Main
IMPORTANT
A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of:
EASY
JEE Main
IMPORTANT
An observer looks at a distant tree of height with a telescope of magnifying power of . To the observer, the tree appears as
HARD
JEE Main
IMPORTANT
In an experiment for determination of refractive index of glass of a prism by v/s plot, it was found that a ray incident at angle , suffers a deviation of and that it emerges at angle . In that case which of the following is closest to the maximum possible value of the refractive index?
EASY
JEE Main
IMPORTANT
To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :
HARD
JEE Main
IMPORTANT
A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface. A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :
MEDIUM
JEE Main
IMPORTANT
A telescope has an objective lens of focal length and an eyepiece of focal length . If a tall tower at a distance of is observed through this telescope in a normal setting, the angle formed by the image of the tower is , then is close to
