Is light visible or invisible?

Light is invisible until it hits an object. It can only be visible to us whenever it get scattered or bounced off the dust particles in the intervening medium. We can see the source of light like stars at night as they are too dim to light up much but that light does hit our eyes and therefore we see the light. The above discussion on visibility of light is only confined to the electromagnetic radiation of wavelength from 400 nm to 700 nm which is called visible light, as these electromagnetic radiations gives the sensation of sight.

Light is, perhaps, the most wonderful of all visible things.

Trigonometry Formulas for Class 10 Maths

Here we are providing trigonometry formulas for class 10 maths. Students are suggested to remember these formulas so that there won’t be any problem in solving questions related to trigonometry. Trigonometry Formulas for Class 10 Maths Trigonometric Ratios (T-RATIOS) of an Acute Angle of a Right Triangle RECIPROCAL RELATION POWER OF T-RATIOS QUOTIENT RELATION OF…

Math Formulas for Class 11 Chapter 5 Complex Numbers and Quadratic Equations

Math Formulas for Class 11 Chapter 5 Complex Numbers and Quadratic Equations Imaginary Numbers The square root of a negative real number is called imaginary number, e.g. $\sqrt{-2}, \sqrt{-5}\$ etc. The quantity $\sqrt{-1}\$ is an imaginary unit and it is denoted by ‘ i ‘ called iota. Integral Power of IOTA(i) Algebra of…

Revision Notes for Class 12 Physics Chapter 12 Atoms

Revision Notes for Class 12 Physics Chapter 12 Atoms Thomson’s model of atom: It was proposed by J. J. Thomson in 1898. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon.…

MCQ Questions for Class 10 Maths Chapter 15 Probability

Here we are providing MCQ Questions for Class 10 Maths Chapter 15 Probability. Students are suggested to go through each and every question to practice the chapter well. MCQ Questions for Class 10 Maths Chapter 15 Probability Q.1 A number is selected at random from the integers 1 to 100. What is the probability that…

Important Derivations for Class 12 Physics Chapter 10 Wave Optics

Important Derivations for Class 12 Physics Chapter 10 Wave Optics Derivations related to Huygens’ Principle (1) Using Huygens’ principle, verify the laws of reflection at a plane surface. First the wavefront touches the reflecting surface at B and then at the successive points towards C. In accordance with Huygens’ principle, from each point on BC…

Math Formulas for Class 11 Chapter 3 Trigonometric Functions

Here we are providing Math Formulas for Class 11 Chapter 3 Trigonometric Functions. These formulas are important for all students studying maths as well as physics. Students studying physics also requires these formulas while deriving some physics formula and it is very useful for solving physics problems also. Students are suggested to remember these formulas.…

Logarithm Formulas

Here we are providing logarithm formulas for maths. These formulas are important for students studying in science and commerce stream. These formulas are very important for Physics and Chemistry also. Students are suggested to go through all the formulas. It will help students to solve physics and chemistry problems involving the concept of logarithm. (a)…

Case Study and Passage Based Questions for Class 9 Maths Chapter 14 Statistics

Case Study and Passage Based Questions for Class 9 Maths Chapter 14 Statistics Case Study Questions: Question 1: The Class teacher of Class X preparing result analysis of a student. She compares the marks of a student obtained in Class IX (2018-19) and Class X (2019-20) using the double bar graph as shown below: (i)…

Case Study Questions for Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure

Case Study Questions for Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure Case Study/Passage Based Questions: Question 1: Lewis dot structure of HCN molecule is given below. Answer questions on the basis of this structure. (i) How many electrons are involved in the sigma bond between the carbon atom and the nitrogen atom?(A)…

Case Study Questions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

Case Study Questions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Case Study Questions: Question 1: The IE1 and IEII in kJ/mol of a few elements are given in the following table: (i) Which of the above element is likely to be alkali metal?(A) P (B) Q (C) R (D)…

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