Question

1.An object is 2 meters from a thin lens with a focal length of 50 cm....

1.An object is 2 meters from a thin lens with a focal length of 50 cm. Apply the thin-lens equation to calculate the image distance from the lens and magnification.

2.A star in a distant galaxy approaches the Sun at 3 X 106 m/s. It emits a photon with a wavelength of 0.4 microns. Apply the Doppler Effect to estimate the observed wavelength of this photon.

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Answer #1

1.

According to lens equation.     OR Image distance ,

f = focal length, 50 cm u = object distance, = 2 m = 2000 m

Magnification,

2.

Doppler equation for Change in wavength is,

Wavelength of source,

Velocity of source,   

Velocity od light,

  

observed wavelength,

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