مسألة في الضوء (التعديل من الإدارة)

[الموهوب66]

السلام عليكم
ممكن احد يحل هذا السؤال

اوجد موضع وصف الصوره المقلوبه بواسطه عدسه مقعره
بعدها البؤري 30cm اذا كان طول الجسم 5cm وكل بعد 96cm , 10cm ?

القانون الى اطبق عليه هو
1/f=1/s+1/s'

[طموحي عالم]

:mommy_cut:

وأنا أيضا عندي أسئلة في الضوء/

Q1/
a-drive the equivalent focal lens of two thin co-axial lenses by a finite distanoe?

b-two lenses with focal length f1=+5.0cm and f2=+10cm are located 5.0cm apart. If an object is located 15.0 cm from the first lens, find the position of the final image?

Q2/
a-define lumen, luminous intensity of source and illumination of a surface?

b-a 100 C.P. lamp hangs 2 m vertically above the center of circular table of 2 m diameter. Determine the intensity of illumination at a point on the edge of the table?

c-a concave spherical surface of radius of curvature 100cm separates two media of refractive indices 1.50 and 1.33 an object is kept in the first medium of a distance of 20 cm from the surface. Calculate the position of the image.

Q3/
a-describe in detail fizeaus method for finding the velocity of light.

b-an object is imaged by a lens on a screen placed 12cm from the lens. When the lens moved twice its distance from the object the screen must be moved 2cm closer to the lens to refocus it. What is the focal length of the lens?

Q4/
a-explain the meaning of chromic aberration in lenses, drive the condition for the achromatism of two lenses in contact, give the name of such system?

b-A photo-voltiac photometer is used to compare the illuminating powers of two lamps. A full scale deflection is obtained in the galvanometer when a source of 20candela is placed a distance of 100cm from it. Calculate the illuminating power of the source which must be placed a distance of 80 cm from the cell to obtain the same deflection in the galvanometer.


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