Test: Ray Optics and Optical Instruments - 1 - CUET Humanities MCQ

Resolving power of telescope = D/1.22λ; where D is diameter of the objective.
So, on using the telescope of diameter 2.54 m in place of 1 m, the resolving power will increase by 2.54 times for the same λ.

Magnification of telescope = Focal length of objective/Focal length of eye piece 
Or magnification of telescope = 200/5 or 40

In a compound microscope, the object is placed just beyond the focus of the objective. Hence, the image formed by the object is real, inverted and highly magnified. Thus, the correct choice is (1).

When the slit is of the same order as of the wavelength of light, then diffraction occurs; light bends and then travels in a straight line.

Optics is the study of nature and property of light.

Apparent depth of the mark = 3/1.5 = 2 cm
This means the mark has apparently moved up by 1 cm. The apparent distance of the mark is 2 cm. So, the microscope has to be moved upward by 1 cm.

As the optical path travelled by the light is d = x (x is the thickness of the window), time taken by the sunlight to travel through the window is:

Magnification of objective lens m