1. Two converging lenses, the first with focal length 25 cm and the second with

Question

1. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image? A. 20 cm after the second lens B. 10 cm before the second lens C. 20 cm before the second lens D. 10 cm after the second lens E. 50 cm after the second lens
2. An object is placed 50 cm in front of a diverging lens. What are the correct signs for the image distance, image height, and focal length for lens?
A. positive positive negative B. negative negative negative C. negative negative positive D. positive negative negative E. negative positive negative
1. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image? A. 20 cm after the second lens B. 10 cm before the second lens C. 20 cm before the second lens D. 10 cm after the second lens E. 50 cm after the second lens
2. An object is placed 50 cm in front of a diverging lens. What are the correct signs for the image distance, image height, and focal length for lens?
A. positive positive negative B. negative negative negative C. negative negative positive D. positive negative negative E. negative positive negative
1. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image? A. 20 cm after the second lens B. 10 cm before the second lens C. 20 cm before the second lens D. 10 cm after the second lens E. 50 cm after the second lens
2. An object is placed 50 cm in front of a diverging lens. What are the correct signs for the image distance, image height, and focal length for lens?
A. positive positive negative B. negative negative negative C. negative negative positive D. positive negative negative E. negative positive negative
1. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image? A. 20 cm after the second lens B. 10 cm before the second lens C. 20 cm before the second lens D. 10 cm after the second lens E. 50 cm after the second lens
2. An object is placed 50 cm in front of a diverging lens. What are the correct signs for the image distance, image height, and focal length for lens?
A. positive positive negative B. negative negative negative C. negative negative positive D. positive negative negative E. negative positive negative
1. Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image? A. 20 cm after the second lens B. 10 cm before the second lens C. 20 cm before the second lens D. 10 cm after the second lens E. 50 cm after the second lens
2. An object is placed 50 cm in front of a diverging lens. What are the correct signs for the image distance, image height, and focal length for lens?
A. positive positive negative B. negative negative negative C. negative negative positive D. positive negative negative E. negative positive negative

Explanation / Answer

f1 = 25 cm ; f2 = 20cm

d = 50cm

l = d' + d1 = 30cm

use: 1/f1 = 1/d + 1/d'

with f1 = 25cm ; d = 50cm

=>1/ d' = 1/25 - 1/50 = 1/50

=>d ' = 50 (cm

because: d' + d1 = l = 30cm

=>d1 = 30 - d' = -20 cm

use 1/f2 = 1/d1 + 1/d'1

=>1/d'1 = 1/20 +1/20 = 1/10

=>d'1 = 10 (cm)

10 cm after the second lens(b)

2)

B. negative negative negative

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