see it too tedious for me to write so i am just giving u an expaination
first assume h and then from the unsilvered lens calculate v now for the silvered lens u can use lens fromula
first u hv to use the formula for refraction through the first side ... and then reflection from the 2nd part..... and again refraction from the 1st part..
then again u hv to use lens formula this time for the 2nd lens.......(which is unsilvered)
if u can get my hint work backwards