What is the fundamental unit of amount of a substance?
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The radius of curvature of a concave mirror is 30 cm. Following Cartesian Sign Convention, its focal length is expressed as
What is the value of acceleration due to gravity at the centre of earth?
When a ray of light travels from a denser medium to a rarer medium, it bends
A lemon kept in water in a glass tumbler appears to be bigger than its actual size when viewed from the sides. This is because of
Which of the following physical quantity measures the rate of work done?
The absolute refractive index of air is
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?
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