1. If the object is located between the focal point and the diverging lens, the image of the object in this lens is: a

1. If the object is located between the focal point and the diverging lens, the image of the object in this lens is:
a) Virtual and enlarged
b) Virtual and reduced
c) Real and enlarged
d) Real and reduced

2. Placing a convex lens with a large radius of curvature on a flat glass surface can create concentric dark and light circles in the reflected light. This phenomenon is caused by:
a) Refraction of light in the lens
b) Reflection of light from the flat glass surface
c) Formation of a real image in the lens
d) Interference of light waves reflected from the lower surface of the lens and the flat glass surface

3. Corpuscular properties of light manifest during:
a) Diffraction of light
b) Dispersion of white light into a spectrum through a prism
c) Photoelectric effect
d) Interference of two light beams

4. Match the description of a physical process with the corresponding formula:
a) Change in the direction of wave propagation when transitioning from one medium to another
b) Amplification of the amplitude of resultant oscillations
c) Reflection of light
d) Emission of electrons due to the action of light
1. β=α
2. sin⁡α/sin⁡γ =v_1/v_2 =n_21
3. ∆d_max=kλ
4. d sin⁡φ=kλ
5. hν=A_вих+(m_e v_max^2)/2

5. The wavelength of violet light in a vacuum is 400 nm. Determine the frequency of this wave.

6. The work function of copper is 4.7 eV. Find the red limit of the photoelectric effect for copper.

7. When illuminating a diffraction grating with light of a wavelength of 590 nm, the third-order spectrum is visible at an angle of 10°. Determine the wavelength for which the second-order spectrum obtained from the same diffraction grating will be visible at an angle of 6°.

8. In a body of water with a depth of 1.5 meters, a pole is submerged, with the upper part of the pole extending 0.5 meters above the water’s surface. Calculate the length of the shadow on the water’s surface and at the bottom of the water body when the Sun is 60° above the horizon.