Which component of fiber-optic connector has a provision of entry for the fibre along with the fixation to connector housing?

The near point of a patient's eye is 50.0 cm. What power (in diopters) must a corrective lens have to enable the eye to see clearly an object 25.0 cm away?

An object is placed 35 cm away from a convex mirror with a focal length of magnitude 15 cm. What is the location of the image?

Rainbow is formed when sunlight undergoes 

A red shirt under a red light appears pale because red