A plane mirror and a concave mirror (f = 7.30 cm) are facing each other and are

Question

A plane mirror and a concave mirror (f = 7.30 cm) are facing each other and are separated by a distance of 15.0 cm. An object is placed between the mirrors and is 7.50 cm from each mirror. Consider the light from the object that reflects first from the plane mirror and then from the concave mirror. Find the location of the image that this light produces in the concave mirror. Specify this distance relative to the concave mirror. need NOW. just the answer if thats all you can do in the next few mins. need now. use my numbers

Explanation / Answer

for plane mirror the image will be formed behind it. also for plane mirror, image distance= object diatance. so for plaane mirror image distance= 7.5 cm

This image acts as an object for the concave mirror, for the concave mirror, object distance= 7.5+15=22.5 cm

f=7.3 cm

now using lens formula

1/f= 1/p + 1/q

1/7.3= 1/22.5 + 1/q

q= 10.8 cm

so the image distance from the concave mirror= 10.8 cm

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