Identify the two lenses of power +4.0d and -1.5d are placed in contact .Identify the two lenses and find focal length of the combina.
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power of lens = 1/f
for lens of power +4d
focal length is 1/4= 0.25
since its focal length is positive so it is converging (convex ) lens
for lens of power -1.5d
focal length is 1/-1.5= -0.33
since its focal length is negative
so it is diverging (concave ) lens
power of the combination is P1+P2
therefore power of combination of lens is
+4-1.5= 2.5
for lens of power +4d
focal length is 1/4= 0.25
since its focal length is positive so it is converging (convex ) lens
for lens of power -1.5d
focal length is 1/-1.5= -0.33
since its focal length is negative
so it is diverging (concave ) lens
power of the combination is P1+P2
therefore power of combination of lens is
+4-1.5= 2.5
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