A convex lens produces an inverted image of size 1.4 cm The size of ob

1.	A convex lens produces an inverted image of size 1.4 cm The size of object is 0.7 cm1. What is magnification in the case2. What is the nature of image3. If the object is at distance 30 cm from the lens calculate focal length of the lens
Answer» 1. m = \(\frac{h_0}{h_1}\) \(\frac{-1.4}{0.7}\) = -2 2. Real, inverted, magnified 3. m = \(\frac{f}{f+u}\) ; -2 = \(\frac{f}{f+-30}\) ,f = 20 cm

A convex lens produces an inverted image of size 1.4 cm The size of object is 0.7 cm1. What is magnification in the case2. What is the nature of image3. If the object is at distance 30 cm from the lens calculate focal length of the lens

Answer»

1. m = \(\frac{h_0}{h_1}\) \(\frac{-1.4}{0.7}\) = -2

2. Real, inverted, magnified

3. m = \(\frac{f}{f+u}\) ; -2 = \(\frac{f}{f+-30}\) ,f = 20 cm