I need help to solve the questions asap thank you 10.A located at a distance of

Question

I need help to solve the questions asap thank you

10.A located at a distance of 10 cm from it An image seems to be at a distance of 5 em from the lens. What is the focal length of the lens? a S(em) h 10 (cm) c. 15 (cm) d 20 (em) 11. A penny is placed at the bottom of a beaker that is 20 em in height. When the from straight above in air? Take n for water to be I.33 beaker is filled with water up to t he rim. where does the penny appear to be if la, Light from the bottom of a swimming pool (n 1.33 ) strikes the surface of water above. What is the cri tical angle fi.c. just before total internal reflection) for this light a, 305? b, 35.6" c. 41.8" d, 48,7 13. A laser of wavelength 633 (nm) illuminates two slits separated by 0.4 (mm) A screen is located 2 (m) from the slits. What is the distance on the screen from the central maxima to the 2"d order bright line? a. 04 (mm) b.0.8 (mm) c. 3.15 (mm) d. 6.3 (mm 14. As light travels from air into glass, its a. Velocity is the same but wavelength decreases b. Velocity decreases but wavelength increases c. Velocity and wavelength hoth decrease d. Velocity increases and wavelength decreases 15. Green light with a wavelength of 550 (nm) and a speed of 3 X10% (ms) in Air travels through Glass (n 1.5) Its speed in glass in (m's) is a. 1.5 X 10 b. 3 X 10 c. 4.5 X10 d. 6 X 10 16. In the above question, the frequency of light in glass (X 10 Hz units) is a. 1.65 b.545 c. 3.63 d 8.17

Explanation / Answer

12 )

given

n = 1.33

the critical angle " C "

sinC = ( 1/n )

C = sin-1 ( 1/n )

= sin-1 ( 1/1.33 )

C = 48.75o

Option : D is correct.

14 )

when a light ray travel from air into the glass is

speed and wavelength is decreases

because the frequency is same,

so the Velocity and wavelength both decreases.

15 )

Vg = ( nair / ng ) X Vair

= ( 1/1.5 ) X 3 X 108

Vg = 2 X 108 m/sec

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