A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is,

A rod of length 30 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image.

A rod AB of length 5 cm lies along the principal axis of the concave mirror of focal length 15 cm in such a way that the end closer to the pole is 30 cm away from it. Find the length of the image.

A rod of length 5cm lies along the principle axis of a concave mirrror of focal length 10cm in such in way that the end farther from the pole is 15cm away form it, Find the length of the image.

A thin rod of length d//3 is placed along the principal axis of a concave mirror of focal length = d such that its image, which is real and elongated, just touches the rod. Find the length of the image ?

A thin rod of length d//3 is placed along the principal axis of a concave mirror of focal length =d such that its image,which is real and elongated,just touches the rod.Find the length of the image?

A luminous point object is moving along the principal axis of a concave mirror of focal length 12 cm towards it. When its distance from the mirror is 20 cm its velocity is 4 cm/s. the velocity of the image in cm/s at that instant is

A luminous point object is moving along the principal axis of a concave mirror of focal length 12cm towards it. When its distance from the mirror is 20cm its velocity is 4cm//s . The velocity of the image in cm//s at that instant is