An object of height 19.7 cm is placed 23.6 cm from a convex lens. What is the angular size of this object?
Answer
Radius of lens
R=2f=2∗23.6=47.2cm2*23.6=47.2cm2∗23.6=47.2cm
Height of object h = 19.7cm
So angular size of object
=Arcradius=19.747.2=0.42=\frac{Arc}{radius}\\=\frac{19.7}{47.2}\\=0.42=radiusArc=47.219.7=0.42
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