Optics Answers

Find the position and magnification, m, of the image formed by a concave mirror of focal length 24 cm when an object is placed 40 cm from the mirror given that m is V/U

an astronomical telescope has a length of 105cm,and its magnification is 6 determine the power of objective and eye piece?

focus of concave mirror is virtual or real

a transparent bag filled with air forms a concave lens when it is immersed in water it behaves as?

An estimate of the refractive index of glass is 1.5. If the angle of incidence is
30o
the angle of refraction is

19o

60o

35o

70o

Figure shows an equiconvex lens (of refractive index 1.5) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45 cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30 cm. What is the refractive index of the liquid ?
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Fig. shows the view through the eye-piece of a prism spectrometer with its slit illuminated by the source of light emitting three wavelengths corresponding to yellow (Y), green (G) and unknown colour (X). The colour X may be:
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1) Red
(2) Orange
(3) Pink
(4) None of these

On a polarizing sheet a mixture of plane polarised and unpolarised light falls normally. On rotating the polarising sheet about the direction of the incident beam, the transmitted maximum and minimum intensities vary by a factor 4. The ratio of the intensities of polarised and unpolarised light is ?

In YDSE,the slits are 2 mm apart and are illuminated by photons of 2 wave length 12000 Ao and 10000 Ao. At what min. Distance from the common central bright fringe on the screen 2m from the slit will a bright from one interference pattern coincide with bright fringe from other ?

A plane mirror is moving with velocity 4Ã+5j+8k. A point object in front of the mirror moves with a velocity 3Ã+4j+5k. Here k is along the normal to the plane mirror and facing towards the object. The velocity of the image is

1. -3Ã+4j+5k

2. 7Ã+9j+11k

3. 3Ã+4j+11k

4. -3Ã-4j+11k