Question : Which telescope was invented by Isaac Newton in the 17th century by using a concave mirror to collect light instead of a simple lens, which produces false colours due to the dispersion of light?
Option 1: Reflecting telescope
Option 2: Infrared telescope
Option 3: Monocular telescope
Option 4: Graphic telescope
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Correct Answer: Reflecting telescope
Solution : The correct option is a Reflecting telescope.
Isaac Newton is credited with inventing the reflecting telescope in the 17th century. The reflecting telescope uses a curved mirror, typically a concave mirror, to collect and focus light. This design was innovative because it helped reduce the problem of chromatic aberration, which is the dispersion of light that causes false colours in images produced by lenses.
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Question : Directions: Select the option that is related to the third term on the same basis as the second term is related to the first term. Mirror : Reflection of light :: Prism : ?
Option 1: Scattering of light
Option 2: Reflection of light
Option 3: Dispersion of light
Option 4: Inversion of light
Question : The redness in the atmosphere at Sunrise and Sunset is due to:
Option 1: Refraction of light
Option 4: Scattering of light
Question : In a filament-type light bulb, most of the electric power consumed appears as
Option 1: visible light
Option 2: infrared rays
Option 3: ultraviolet rays
Option 4: fluorescent light
Question : Dioptre is the unit of:
Option 1: power of a lens
Option 2: focal length of a lens
Option 3: light intensity
Option 4: sound intensity
Question : A star appears twinkling in the sky because of :
Option 1: scattering of light by atmosphere
Option 2: reflection of light by atmosphere
Option 3: refraction of light by atmosphere
Option 4: diffraction of light by atmosphere
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