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A light beam of diameter root 3R is incident symmetrically on a glass hemisphere of radius R and of refractive index n = root 3. Find radius of the beam at the base of hemisphere. A light beam of diameter root 3R is incident symmetrically on a glass hemisphere of radius R and of refractive [...]

If sin 3a = cos(a – 26 degree),where 3a is an acute angle then find the value of a. If sin 3a = cos(a - 26 degree) where 3a is an acute angle then find the value of a. October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 [...]

A fish is 60 cm under water (mu = 4/3). A bird directly overhead looks at the fish. If the bird is at a distance of 120 cm from the water surface, (a) what is the apparent position of the fish as seen by the bird and (a) what is the apparent position of the [...]

Evaluate tan 65 degree / cot 25 degree Evaluate tan 65 degree / cot 25 degree October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,

A beam of width t is incident at 45 on an air-water boundary. The width of the beam in water is ……………………………………………. A beam of width t is incident at 45 on an air-water boundary. The width of the beam in water is .................................................... October 5, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]

A converging set of rays, travelling from water to air, is incident on a plane interface, the rays would have converged to a point O. 60 cm above the interface. However, due to refraction the rays will bend. A converging set of rays due to refraction the rays will bend. is incident on a plane [...]

If sin(A-B) = 1/2 and cos(A+B) = 1/2,0 degree < A+B B, then find A and B. 0 degree < A+B B If sin(A-B) = 1/2 and cos(A+B) = 1/2 then find A and B. October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,

In triangle PQR right angled at Q, PQ=3cm & PR=6cm. Determine angle QPR & angle PRQ. In triangle PQR right angled at Q PQ=3cm & PR=6cm. Determine angle QPR & angle PRQ. October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,

Find the velocity of image w.r.t. ground. The mirror is at rest and the object is moving perpendicular to the axis with 5 cm/s as in figure. Find the velocity of image w.r.t. ground. The mirror is at rest and the object is moving perpendicular to the axis with 5 cm/s as in figure. October [...]

In triangle ABC right angled at B . AB=5cm and angle ACB =30` determine the lengths of the sides BC and AC. In triangle ABC right angled at B . AB=5cm and angle ACB =30` determine the lengths of the sides BC and AC. October 5, 2020 Category: Chapter 8 - Introduction to Trigonometry , [...]