Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

When a person is moving with a constant speed the speed of his/her image appears to increase substantially as he/she moves closer to the mirror as noticed by a person sitting in a stationary car. Why? 
Asked by prakriti12oct | 11 Feb, 2020, 02:48: PM
Expert Answer
We know, 
 
Vimage  = m2 Vobject
 
Vimage = Velocity of image
Vobject = Velocity of object 
 
So when the object is moving towards the convex mirror (mirror of vehicle used is rear view mirror) its magnification increases. As the magnification increases, the sqaure of magnification and product of it with velocity of object also increases. Thus, speed of image moving closer to stationary convex mirror appears to be increasing substantially even if the speed of object is constant. 
 
Answered by Shiwani Sawant | 12 Feb, 2020, 06:01: PM

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
a thin stick of length f/5 is placed along principle axis of a concave mirror of focal length f such that it's image which is real and elongated just touches the stick .what is the magnification
Asked by amishavasave56.12dgatl | 27 Aug, 2021, 05:25: PM
ANSWERED BY EXPERT
CBSE 12-science - Physics
Sign convention in concave mirror
Asked by raushankumarmushkipur | 02 Apr, 2021, 10:08: AM
ANSWERED BY EXPERT
CBSE 12-science - Physics
When a person is moving with a constant speed the speed of his/her image appears to increase substantially as he/she moves closer to the mirror as noticed by a person sitting in a stationary car. Why? 
Asked by prakriti12oct | 11 Feb, 2020, 02:48: PM
ANSWERED BY EXPERT
CBSE 12-science - Physics
Use the mirror equation to deduce that The virtual image produced by a convex mirror is always diminished in size.  
Asked by prakriti12oct | 27 Jun, 2019, 02:20: AM
ANSWERED BY EXPERT
CBSE 12-science - Physics
Derive mirror formula for concex mirror.
Asked by polyrelation | 15 Mar, 2019, 04:42: PM
ANSWERED BY EXPERT
CBSE 12-science - Physics
A convex mirror of radius of curvature 70 cm and a plane mirror are placed facing each other. The distance between them is 28 cm.  A point object is put midway between them on the principle axis of the mirror. Two images of the object are seen in the plane mirror. Find their distances from the plane mirror. 
Asked by mridulabarua05 | 11 Feb, 2019, 01:10: PM
ANSWERED BY EXPERT
CBSE 12-science - Physics
1. The interior of a hollow metal sphere is polished to serve as a mirror. At a point 12cm from the centre of the sphere of radius 24 cm, a point source of light is placed. Locate its image formed by two successive reflections, the first reflection taking place at the  (a) far wall (b) near wall.  2. And image produced by a concave mirror is one fourth the size of the object.  If the object is moved 10 cm towards the mirror, its image will be only half the size of the object. Calculate the focal length of the mirror. 
Asked by mridulabarua05 | 07 Feb, 2019, 09:10: AM
ANSWERED BY EXPERT
CBSE 12-science - Physics
A point luminous source P is placed on the principle axis of a concave mirror of radius of radius of curvature 1m at a distance of 75 cm from its pole. At what distance from the concave mirror should a plane mirror be set so that the rays from P, after reflection from the concave mirror and then from the plane mirror again converge at the point P? Does the point of convergence of the rays change if they are first reflected at the plane mirror and then at the concave mirror?
Asked by mridulabarua05 | 02 Feb, 2019, 11:23: AM
ANSWERED BY EXPERT
CBSE 12-science - Physics
derive mirror formula  
Asked by Aadeshveersingh03 | 07 Jan, 2019, 07:57: AM
ANSWERED BY EXPERT
CBSE 12-science - Physics
sign convention in ray optics  
Asked by mkiruthiga90 | 14 Dec, 2018, 07:32: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get FREE Sample Mock Papers for Final Exams
Download Now
×