The photovoltaic or photoconductive detectors are packaged as _________

Charge coupled devices

Star detectors

Star position fixer

Photon coupled devices

Correct Answer : Charge coupled devices

Explanation : The photovoltaic or photoconductive detectors are packaged as charge coupled devices. These can produce an array of small cells or pixels. CCD is a closely spaced monolithic array of metal insulator semiconductor capacitors.

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Anti reflection coated optics reduce ________

Refraction

Reflection angle

Intensity of star image

Optical transmission losses

Correct Answer : Option (D) : Optical transmission losses

Explanation : For anti-reflection coated optics, the optical transmission losses may be 1% or 2% at each air to glass or glass to air optical control surface within the telescope, including windows or sensor covers or surfaces. For uncoated optics, the loss per surface is about 4% to 5%.

The ratio of the focal length to aperture is called the ________

Focal number

f/ number

Critical aperture

Effective aperture

Correct Answer : Option (B) : f/ number

Explanation : The ratio of focal length to aperture is called the f/ number. For example, an f/10 telescope may have a 30 in. focal length and a 3 in. aperture.

The physical size of the star depends upon _____

Shape of image

Colour of image

Angular size of image

Intensity of image

Correct Answer : Option (C) : Angular size of image