43. Read the following and answer the given questions from 43() to 43(v) A spherical mirror produces an image of magnification - 1 on a screen placed at a distance of 50 cm from the mirror () Which of the following type of mirror is used in the above lines? (a) Convex mirror (b) Concave mirror (c) Plane mirror (d) None of these (ii) The distance of the image from the object is (a) 0 cm (b) 10 cm (C) 50 cm (d) 100 cm (iii) The focal length of the mirror is (a) - 10 cm (b) -15 cm (c) - 20 cm (d) -25 cm (iv) Under which of the following conditions a concave mirror can form an image larger than the actual object? (a) When the object is kept at a distance equal to its radius of curvature (b) When the object is kept at a distance less than its focal length (c) When the object is placed between the focus and the centre of curvature (d) When the object is kept at a distance greater than its radius of curvature (v) Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object (a) 15 cm in front of the mirror (b) 30 cm in front of the mirror (c) Between 15 cm and 30 cm in front of the mirror (d) More than 30 cm in front of the mirror
Answers
Answered by
1
Answer:
(a) As magnification is in negative the image will be down the principle axis compared to the object and will form in Concave Mirror.
(b) The distance of image from the object is zero, real and inverted image of the same size is formed at the same place where object is placed.
(c) Spherical mirror has a radius of curvature R and a focal length i.e
F=
2
R
F=
2
50
F=25cm
(d) Figure attached shows the image formation by concave mirror for the given case.
solution
Similar questions