A diverging lens has a focal length of - 15 cm A 5-cm tall object is placed +35

Question

A diverging lens has a focal length of - 15 cm A 5-cm tall object is placed +35 cm from the lens. Determine the approximate distance between the object and the image. A) 45 cm B) 24 cm C) 18 cm D) 10 cm E) 7 cm An object is place d 6.5 cm in front of a converging lens that has a focal length of 14 cm. Which one of the following statements is true concerning the image? A) The image is virtual and 6.0 cm from the lens. B) The image is virtual and 12 cm from the lens. C) The image is real and 3.0 cm from the lens. D) The image is real and 6.0 cm from the lens. E) The image is real and 12 cm from the lens. Light propagates from soda lime glass (n = 1.518) into Pyrex glass (n = 1.473). Determine the critical angle for this situation. A) 76.01 degree B) 65.22 degree C) 52.48 degree D) 45.86 degree E) 13.99 degree Which one of the following types of wave is fundamentally different than the other four? A) radio waves B) sound waves C) microwaves D) ultraviolet rad

Explanation / Answer

Solution:

19.

Using lens formula:

1/v -1/u = 1/f

=> 1/-15 = 1/v + 1/35

=> 1/v = 1/-15 - 1/35

=> v = -10.5 cm

hence the distance from the image would simply be:
v +u

=> -10.5+35

=> 24.5 cm

(24 cm Approx.)

22.

B. sound waves

two main differences between sound waves and light waves.

1. Sound waves travel through air at the speed of approximately 1,100 feet per second; light wavestravel through air and empty space at a speed of approximately 186,000 miles per second.

2. Sound is composed of longitudinal waves (alternate compressions and expansions ofmatter) and light is composed of transverse waves in an electromagnetic field.

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