Geometrical Optics Questions

If the focal length of objective lens is increased then magnifying power of

The refracting angle of a prism is A, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is :-

Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is fi...

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source I. Wh...

A thin prism having refracting angle 10o is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersio...

The angle of incidence for a ray of light at a refracting surface of a prism is 45o. The angle of prism is 60o. Ifthe ray suffers minimum deviation through the prism, the angle of minimum deviation an...

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance:

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by themirror]...

The refractive index of the material of a prism is 2and the angle of the prism is 30o. One of the two refracting surfaces of the prism is made a mirror inwards , by silver coat ing. A b eam of monochr...

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be...

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of :-

A ray of light travelling in the direction is incident on a plane mirror. After reflection,it travels along the direction . The angle of incidence is :-...

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ1 and μ2 and R i...

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retin...

A green light is incident from the water to the air - water interface at the critical angle(θ). Select the correct statement

The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns backthrough the same path after suffering reflection ...

A bird is flying with a velocity v between two long vertical plane mirrors making an angles θ with mirror M1 as shown. Then what will be the relative be the relative velocity of approach between ...

A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm as shown in figure. At what distance x from the lens should a concave mirror of focal length 60 cm. placed so...

A parallel beam of white blight falls on a convex lens. Images of blues, red and green light are formed on other side of the the at distance x,y and z. respectively from the pole of the lens :...

A transparent thin film of uniform thickness and refractive index n1 = 1.4 is coated on the convex spherical surface of radius R at one end of a long solid glass cylinder of refractive index n2 = 1.5,...