-An object is placed 10 cm far from a convex lens whose focal length is 5 cm. Wh

Question

-An object is placed 10 cm far from a convex lens whose focal length is 5 cm. What is the image distance? A)5cm B)10 cm C) 15cm D) 20cm E)none. -In the R-L-C series circuit, current is determined i=20sin(200t). What is the power loss in the resistor R? A) 400 R watts B) 20 R watts C) 200 R watts D) 100R watts E) 50 Rbwatts -An object is placed 10 cm far from a convex lens whose focal length is 5 cm. What is the image distance? A)5cm B)10 cm C) 15cm D) 20cm E)none. -In the R-L-C series circuit, current is determined i=20sin(200t). What is the power loss in the resistor R? A) 400 R watts B) 20 R watts C) 200 R watts D) 100R watts E) 50 Rbwatts

Explanation / Answer

(1) Convex lens is converging lens

f = 5 cm

Do = 10 cm

1/f = 1/Do + 1/Di

1/Di = 1/f - 1/Do = 1/5 - 1/10 = 1/10

Di = 10 cm

Image distance = 10 cm ( behind the lens)

(2) i = 20 sin(200 t)

Power loss in the resistor R = i^2 R = 400 R watts

  

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