convex lens made up of glass (refractive index 1.5 ) and radius of curvature R is dipped into water. Its focal length will be (refractive index of water is 4/3)
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The moon orbits Earth following a nearly circular path.
The gravitational pull of Earth on the moon is parallel to the velocity of the moon.
The moon orbits Earth in 1 Earth day.
The same face of the moon always points toward Earth.
The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.
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