10 Question MCQ (including Assertion)

A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analyzing these measurements of angles, his conclusion would be

In the following ray diagram, the correctly marked angle are:

A teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of the screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as:
(i) 12.7 cm
(ii) 29.7 cm
(iii) 57.7 cm
(iv) 72.7 cm

The correct position of the screen was suggested by

Assertion (A): The focal length of the convex mirror will increase, if the mirror is placed in water.
Reason (R): The focal length of a convex mirror of radius R is equal to, f = R/2.

Assertion (A): Plane mirror may form real image.
Reason (R): Plane mirror forms virtual image, if object is real.

To determine the approximate focal length of the given convex lens by focusing on a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always:

An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device

Assertion (A): An object is placed at a distance of f from a convex mirror of focal length f, its image will form at infinity.
Reason (R): The distance of image in a convex mirror can never be infinity.

Study the following ray diagram:
In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by: