Wednesday
April 1, 2015

Homework Help: physics

Posted by Susy on Sunday, March 23, 2014 at 3:00pm.

A light bulb is placed 16.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.40 cm closer to the mirror. Calculate the focal length of the concave mirror.

i know that for plane mirrors distance of object=distance of image so i should just add 5.40 cm to 16.6 for di of the concave mirror, but it keeps saying my answer is wrong

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - A light bulb is placed 21.7 cm in front of a concave mirror. When the...
physics - A light bulb is placed 17.1 cm in front of a concave mirror. When the ...
physics --- - A concave spherical mirror has a radius of curvature 15 cm. A 1 cm...
physics - A concave spherical mirror has a radius of curvature 15 cm. A 1 cm ...
physics - A 4.5 cm tall object is placed 20 cm in front of a spherical mirror. ...
Physics - A concave spherical mirror has a radius of curvature 15 cm. A 1 cm ...
Physics - A candle is placed 17.0 cm in front of a convex mirror. When the ...
physics - TRUE OR FALSE The virtual image formed by a convex mirror is always ...
physics - An object with a height of 42 cm is placed 1.6 m in front of a concave...
physics - An object 5cm is placed 30cm in front of a concave mirror.The image ...

Members