Physics
Assertion (A) : For a ray of light incident at an angle of incidence i = 0°, angle of reflection is r = 0°.
Reason (R) : The angle of incidence i is equal to angle of reflection r.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because if a ray of light hits the mirror perpendicularly (i.e., along the normal), the angle of incidence is 0°, and the ray reflects back along the same path. So, angle of reflection is also 0°.
Reason (R) is true because it's a law of reflection which states that during reflection, angle of incidence is always equal to angle of reflection so the Reason correctly explains the Assertion.
Related Questions
The figure shows the image of a clock as seen in the plane mirror. The correct time is :
- 4:30
- 6:30
- 2:30
- 3:30
We use a concave polished metallic surface as a reflector in a torch to obtain a parallel beam of light. The position of the bulb is :
- at the centre of curvature of the reflector.
- at the focus of the reflector
- between the focus and centre of curvature of the reflector
- can be any of the above options
Assertion (A) : The image of an object placed close to a concave mirror is a real image.
Reason (R) : A real image is formed due to the actual intersection of the reflected rays.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : For a real image formed by a spherical mirror, linear magnification (m) is positive.
Reason (R) : Both u and v are negative for a real image.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false