Question 3
Under which of the 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 object is kept at a distance less than its focal length.
(c) When object is placed between the focus and centre of curvature.
(d) When object is kept at a distance greater than its radius of curvature.
Question 3
Under which of the 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 object is kept at a distance less than its focal length.
(c) When object is placed between the focus and centre of curvature.
(d) When object is kept at a distance greater than its radius of curvature.
(i) A concave mirror can form an image larger than the actual object when the object is placed between the focus (F) and centre of curvature (C). The image is larger compared to the size of the object and it is real and inverted.
(ii) A concave mirror can form an image larger than the actual object when the object is placed between the focus (F) and pole (P) of the mirror. The image formed here is virtual and erect and it is larger than the object.
Thus the correct options are both (b) and (c):
(b) When object is kept at a distance less than its focal length.
(c) When object is placed between the focus and centre of curvature.
(i) A concave mirror can form an image larger than the actual object when the object is placed between the focus (F) and centre of curvature (C). The image is larger compared to the size of the object and it is real and inverted.
(ii) A concave mirror can form an image larger than the actual object when the object is placed between the focus (F) and pole (P) of the mirror. The image formed here is virtual and erect and it is larger than the object.
Thus the correct options are both (b) and (c):
(b) When object is kept at a distance less than its focal length.
(c) When object is placed between the focus and centre of curvature.
