Assertion & Reason Test: Light- Reflection & Refraction - Class 10 MCQ

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A point object is placed at a distance of 26 cm from a convex mirror of focal length 26 cm. The image will not form at infinity.

Reason : For above given system the equation 1/u + 1/v = 1/f gives v = ∞

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : If both plane mirror and object are moved through a distance x , then the image moves through a distance 2x .

Reason : When the object is fixed and plane mirror is moved through a distance x . Then the image is also moves through the distance 2x .

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Large concave mirrors are used to concentrate sunlight to produce heat in solar cookers.

Reason : Concave mirror converges the light rays falling on it to a point.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : If the rays are diverging after emerging from a lens; the lens must be concave.

Reason : The convex lens can give diverging rays.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A ray of light incident along the normal to the plane mirror retraces its path after reflection from the mirror.

Reason : A ray of light along the normal has angle of incidence as π /2 and hence, it retraces its own path after reflection from mirror.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Refractive index has no units.

Reason : The refractive index is a ratio of two similar quantities.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : When a concave mirror is held under water, its focal length will increase.

Reason : The focal length of a concave mirror is independent of the medium in which it is placed.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : If both object and plane mirror are moved through a distance x , then the image moves through a distance 2x .

Reason : If object is fixed and plane mirror is moved through a distance x then the image also moves through a distance 2x .

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Red light travels faster in glass than green light.

Reason : The refractive index of glass is less for red light than for green light.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The image formed by a concave mirror is certainly real if the object is virtual.

Reason : The image formed by a concave mirror is certainly virtual if the object is real.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A convex mirror is used as a driver’s mirror.

Reason : Convex mirrors have a wider field of view as they are curved outwards. They also give an erect, though diminished image.

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : As light travels from one medium to another, the frequency of light does not change.

Reason : Because frequency is the characteristic of source.