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Calculate the resolving power of a grating at second order when sodium light 589 NM gets diffracted resolving 0.6 NM find lines

If the light ray moves from inside the glass toward the glass-air interface at an angle of 35.0° to the normal, determine the angle of refraction. The ray bends ________° away from the normal, as expected.

submarine is 20m below the surface of the sea.The pressure due to the water at the depth is P.On anotherday, the submarine is 26m below the surface of the fresh water.The density of sea is 1.3times the density of fresh water.What is the pressure due to the fresh water at a depth of 26m?
A 2.5 cm-tall object stands in front of a converging lens. It is desired that a virtual image 2.2 times larger than the object be formed by the lens. How far from the lens (in cm) must the object be placed to accomplish this task, if the final image is located 12 cm from the lens?
Why can we see our real and inverted image inside a concave mirror when the image is formed in front of it and not behind?

Sir if you say that if our eyes try to image the real image formed by the mirror in the mirror it self then-

Imagine a situation where we have a concave mirror is of large size and we ourself is object and we are directly seeing in the concave mirror and moving backwards so when I stand between focus and poleI see my virtual image slowly when I move backward between focus and centre of curvature then my image must be forming behind me then how my eyes are able to see my real image in the mirror….

Sir to image the real image my eyes must see the image first but in this case how without seeing the image my eyes can see the real image in the mirror it self…..

Sir please answer me in detail

Calculate phase shifts for quantum scattering, and then in terms of these phases give an account on scattering amplitude. As an application consider a sphere of radius r, assuming a certain potential V such that it is infinite inside the sphere and minimum outside the sphere,calculate phase shifts for this sphere.

A police officer's stationary radar device indicates that the frequency of the radar wave reflected from an automobile is less than the frequency emitted by the radar device. What is the direction of motion of the automobile with respect to the police officer?

If a lens produces a real image that is four times as the object and is located 24cm from the lens, what is the
focal length of the lens?
If two plane mirror are inclined at an angle of 450' calculate the number of images formed.
Two steel bars, 2.0m long each are used to construct a rail line. maximum temperature change is 450C. what would be the safe that must be between the bars
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