Total internal reflection occurs only when transitioning from a denser medium to a less dense medium because the angle of incidence must be greater than the critical angle for the phenomenon to occur. This critical angle is the angle at which the refracted ray would travel along the boundary between the two mediums. When transitioning from a less dense medium to a denser medium, the refracted ray will bend towards the normal, making it impossible for the angle of incidence to exceed the critical angle and thus preventing total internal reflection. **

Total internal reflection occurs in a dense thin medium when a light ray traveling from a denser medium to a rarer medium strikes the interface at an angle greater than the critical angle. This critical angle is the angle of incidence at which the refracted angle in the rarer medium is 90 degrees. When the angle of incidence exceeds the critical angle, the light ray is reflected back into the denser medium instead of refracting out, resulting in total internal reflection. This phenomenon is used in various optical devices such as fiber optics to transmit light efficiently over long distances. **

One way to escape from wanderlust is to find a balance between satisfying the desire for adventure and the need for stability. This can be achieved by setting aside time for regular travel or exploration while also creating a sense of home and routine in everyday life. Additionally, finding activities or hobbies that provide a sense of fulfillment and excitement can help satisfy the urge to wander. It's also important to practice mindfulness and gratitude for the present moment, allowing oneself to appreciate the beauty and opportunities in the current surroundings. **

An external medium refers to the environment or surroundings outside of an organism or system. It includes factors such as temperature, humidity, and other external conditions that can impact the organism. On the other hand, an internal medium refers to the internal environment within an organism or system, such as the bloodstream or cellular environment. It includes factors like pH, oxygen levels, and nutrient concentrations that are regulated to maintain homeostasis within the organism. **

Becoming a medium typically involves developing and honing one's psychic abilities and learning how to communicate with spirits. It often requires training, practice, and dedication to the craft. While some people may have a natural inclination towards mediumship, it is still a skill that can be developed and improved over time. Therefore, one can become a medium through learning and practice, rather than simply being born as one. **

When deciding which medium to choose for a particular message or communication, it is important to consider the audience, the nature of the message, and the desired outcome. For example, if the message is urgent and requires immediate attention, a phone call or text message may be the best medium. If the message is more detailed or complex, an email or written letter may be more appropriate. Additionally, considering the preferences and accessibility of the audience can help determine the most effective medium for communication. **

Medium rare meat is generally safe to eat as long as it has been cooked to the appropriate internal temperature to kill any harmful bacteria. However, consuming undercooked meat can pose a risk of foodborne illnesses such as E. coli or salmonella. It is important to ensure that the meat has reached a safe internal temperature to reduce the risk of foodborne illnesses. **

Yes, there is a medium. In the context of communication and art, a medium refers to the material or method used to convey a message or create a work of art. For example, in visual arts, the medium could be oil paint, watercolor, or digital media. In communication, the medium could be spoken language, written text, or digital platforms. Understanding the medium is important for effectively conveying a message or creating a meaningful work of art. **