4. Answer the following questions:
a.
b.
Write a formula of lens and magnification of lens.
C.
d.
e.
f.
نعمه
the object placed? Draw a ray diagram.
What is the function of the retina?
How does the eye
. control the amount of light entering it?
What type of
What is myopia? How is it corrected?
What is hypermetropia? How is it corrected?
An object is
Sanjay sees distant objects comfortably but he wears spectado
An object is
book.
Find
i. What defect of vision does he have?
ii. Which type of spectacles should he use?
wil. Is the
i.
Draw a diagram to show how a convex lens forms a magufuli
A convex lens forms a real image of the same size as that of
e of defect of vision does she have? Sketch a ray diagram for

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.