Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
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.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
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 convex mirror can never be infinity.
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion (A): If the rays are diverging after emerging from a lens; the lens must be concave.
Reason (R): The ST 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 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.
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