A concave mirror has a focal length of 20 cm. Find the position or positions of an object for which the imagesize is double of the object-size.

(d) When an object is placed between the pole and principal focus of a concave mirror, the image formed is virtual, erect, and larger than the object.

The image formed by a concave mirror is virtual, erect and larger only when the object is placed between the pole of the mirror and its principal focus. So correct...

Given, u=-10 cm, f=+15 cm,v=? From mirror formula, 1/f=1/v+1/u or 1/v=1/f=1/u =1/v=1/15=1/(-10)=1/15+1/10=(2+3)/30 or  v=30/5=+6 cm That is image is formed at a distance of 6 cm from the mirror behind it. The image is erect...

By observing the virtual images formed by the three mirrors, we can distinguish between the mirrors as: (i) Plane mirror will produce an image of the same size, (ii) Concave mirror will...

A concave mirror  produces a magnified image when the object is placed in front of the mirror: (i) between  its pole and focus (ii) between the focus and centre of curvature In case (i) the...

(b) concave mirror or convex lens.

(b) concave mirror or convex lens.

(c) both concave mirror and convex lens.

(a) Virtual image formed is larger in size in case of concave mirror.

(a) Real, inverted and same in size because object is at the centre of curvature of the mirror.