Aconverging equiconvex lens of glass of refractive index 1.5 is laid on a horizontal plane mirror. a pin coincides with its inverted image when it is 1.0m above the lens. when some liquid is placed between the lens and the mirror, the pin has to be raised by 0.55m
for coacidence to occur again. what is the refractive index of the liquid?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

The law of reflection states that the angle of reflection is equal to the angle of

What are the dimensions of the cross section that passes through the points a, f, g, and d?